618617664 has 84 divisors (see below), whose sum is σ = 2026477024. Its totient is φ = 176746752.

The previous prime is 618617663. The next prime is 618617669. The reversal of 618617664 is 466716816.

618617664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (84).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618617663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72682 + ... + 80745.

Almost surely, 2^618617664 is an apocalyptic number.

618617664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

618617664 is an abundant number, since it is smaller than the sum of its proper divisors (1407859360).

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

618617664 is a wasteful number, since it uses less digits than its factorization.

618617664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153452 (or 153439 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 618617664 is about 24872.0257317332. The cubic root of 618617664 is about 852.0677060524.

The spelling of 618617664 in words is "six hundred eighteen million, six hundred seventeen thousand, six hundred sixty-four".