642217627476 has 72 divisors (see below), whose sum is σ = 1626676407720. Its totient is φ = 213638670336.

The previous prime is 642217627453. The next prime is 642217627477. The reversal of 642217627476 is 674726712246.

642217627476 is a `hidden beast` number, since 6 + 4 + 2 + 2 + 1 + 7 + 627 + 4 + 7 + 6 = 666.

642217627476 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 96279884100 + 545937743376 = 310290^2 + 738876^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642217627477) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51881800 + ... + 51894176.

It is an arithmetic number, because the mean of its divisors is an integer number (22592727885).

Almost surely, 2^642217627476 is an apocalyptic number.

It is an amenable number.

642217627476 is an abundant number, since it is smaller than the sum of its proper divisors (984458780244).

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

642217627476 is a wasteful number, since it uses less digits than its factorization.

642217627476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15193 (or 15188 counting only the distinct ones).

The product of its digits is 9483264, while the sum is 54.

The spelling of 642217627476 in words is "six hundred forty-two billion, two hundred seventeen million, six hundred twenty-seven thousand, four hundred seventy-six".