1664964450 has 96 divisors (see below), whose sum is σ = 4598812800. Its totient is φ = 442935360.

The previous prime is 1664964437. The next prime is 1664964451. The reversal of 1664964450 is 544694661.

It is a happy number.

1664964450 is a `hidden beast` number, since 166 + 49 + 6 + 445 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 1664964396 and 1664964405.

It is not an unprimeable number, because it can be changed into a prime (1664964451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 685939 + ... + 688361.

It is an arithmetic number, because the mean of its divisors is an integer number (47904300).

Almost surely, 2^1664964450 is an apocalyptic number.

1664964450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1664964450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2299406400).

1664964450 is an abundant number, since it is smaller than the sum of its proper divisors (2933848350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1664964450 is a wasteful number, since it uses less digits than its factorization.

1664964450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2953 (or 2942 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 1664964450 is about 40803.9759092175. The cubic root of 1664964450 is about 1185.2273237977.

The spelling of 1664964450 in words is "one billion, six hundred sixty-four million, nine hundred sixty-four thousand, four hundred fifty".