655391420544 has 128 divisors (see below), whose sum is σ = 1989840643200. Its totient is φ = 187230265344.

The previous prime is 655391420521. The next prime is 655391420557. The reversal of 655391420544 is 445024193556.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 655391420493 and 655391420502.

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, 34636174 + ... + 34655090.

It is an arithmetic number, because the mean of its divisors is an integer number (15545630025).

Almost surely, 2^655391420544 is an apocalyptic number.

655391420544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

655391420544 is an abundant number, since it is smaller than the sum of its proper divisors (1334449222656).

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

655391420544 is a wasteful number, since it uses less digits than its factorization.

655391420544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31830 (or 31818 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 48.

The spelling of 655391420544 in words is "six hundred fifty-five billion, three hundred ninety-one million, four hundred twenty thousand, five hundred forty-four".