655938659840 has 160 divisors (see below), whose sum is σ = 1662747372000. Its totient is φ = 247476584448.

The previous prime is 655938659839. The next prime is 655938659861. The reversal of 655938659840 is 48956839556.

It is a tau number, because it is divible by the number of its divisors (160).

It is a hoax number, since the sum of its digits (68) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11109116 + ... + 11168004.

It is an arithmetic number, because the mean of its divisors is an integer number (10392171075).

Almost surely, 2^655938659840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655938659840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (831373686000).

655938659840 is an abundant number, since it is smaller than the sum of its proper divisors (1006808712160).

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

655938659840 is a wasteful number, since it uses less digits than its factorization.

655938659840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59160 (or 59144 counting only the distinct ones).

The product of its (nonzero) digits is 279936000, while the sum is 68.

The spelling of 655938659840 in words is "six hundred fifty-five billion, nine hundred thirty-eight million, six hundred fifty-nine thousand, eight hundred forty".