64155847780 has 24 divisors (see below), whose sum is σ = 137860474752. Its totient is φ = 25065540192.

The previous prime is 64155847771. The next prime is 64155847799. The reversal of 64155847780 is 8774855146.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37299052 + ... + 37300771.

It is an arithmetic number, because the mean of its divisors is an integer number (5744186448).

Almost surely, 2^64155847780 is an apocalyptic number.

It is an amenable number.

64155847780 is an abundant number, since it is smaller than the sum of its proper divisors (73704626972).

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

64155847780 is a wasteful number, since it uses less digits than its factorization.

64155847780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74599875 (or 74599873 counting only the distinct ones).

The product of its (nonzero) digits is 7526400, while the sum is 55.

The spelling of 64155847780 in words is "sixty-four billion, one hundred fifty-five million, eight hundred forty-seven thousand, seven hundred eighty".