642410755578 has 24 divisors (see below), whose sum is σ = 1393728692148. Its totient is φ = 213854038272.

The previous prime is 642410755573. The next prime is 642410755579. The reversal of 642410755578 is 875557014246.

It is a happy number.

642410755578 is a `hidden beast` number, since 6 + 4 + 2 + 4 + 10 + 7 + 55 + 578 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 580273727049 + 62137028529 = 761757^2 + 249273^2 .

It is a super-2 number, since 2×642410755578² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (642410755573) 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, 23559351 + ... + 23586602.

Almost surely, 2^642410755578 is an apocalyptic number.

642410755578 is an abundant number, since it is smaller than the sum of its proper divisors (751317936570).

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

642410755578 is a wasteful number, since it uses less digits than its factorization.

642410755578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47146718 (or 47146715 counting only the distinct ones).

The product of its (nonzero) digits is 9408000, while the sum is 54.

The spelling of 642410755578 in words is "six hundred forty-two billion, four hundred ten million, seven hundred fifty-five thousand, five hundred seventy-eight".