1664290650 has 96 divisors (see below), whose sum is σ = 4767605568. Its totient is φ = 379724800.

The previous prime is 1664290643. The next prime is 1664290651. The reversal of 1664290650 is 560924661.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1664290599 and 1664290608.

It is not an unprimeable number, because it can be changed into a prime (1664290651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1617 + ... + 57716.

It is an arithmetic number, because the mean of its divisors is an integer number (49662558).

Almost surely, 2^1664290650 is an apocalyptic number.

1664290650 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 1664290650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2383802784).

1664290650 is an abundant number, since it is smaller than the sum of its proper divisors (3103314918).

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

1664290650 is a wasteful number, since it uses less digits than its factorization.

1664290650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59376 (or 59371 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 1664290650 is about 40795.7185253551. The cubic root of 1664290650 is about 1185.0674176958.

The spelling of 1664290650 in words is "one billion, six hundred sixty-four million, two hundred ninety thousand, six hundred fifty".