1664618046 has 64 divisors (see below), whose sum is σ = 4135961088. Its totient is φ = 434901888.

The previous prime is 1664617957. The next prime is 1664618071. The reversal of 1664618046 is 6408164661.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1664617989 and 1664618007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44176 + ... + 72668.

It is an arithmetic number, because the mean of its divisors is an integer number (64624392).

Almost surely, 2^1664618046 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1664618046, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2067980544).

1664618046 is an abundant number, since it is smaller than the sum of its proper divisors (2471343042).

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

1664618046 is a wasteful number, since it uses less digits than its factorization.

1664618046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28625.

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 1664618046 is about 40799.7309549953. The cubic root of 1664618046 is about 1185.1451206487.

The spelling of 1664618046 in words is "one billion, six hundred sixty-four million, six hundred eighteen thousand, forty-six".