642556700946 has 24 divisors (see below), whose sum is σ = 1465480195920. Its totient is φ = 202912642296.

The previous prime is 642556700923. The next prime is 642556700963. The reversal of 642556700946 is 649007655246.

642556700946 is a `hidden beast` number, since 6 + 42 + 556 + 7 + 0 + 0 + 9 + 46 = 666.

It is a super-2 number, since 2×642556700946² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642556700892 and 642556700901.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 939410040 + ... + 939410723.

It is an arithmetic number, because the mean of its divisors is an integer number (61061674830).

Almost surely, 2^642556700946 is an apocalyptic number.

642556700946 is an abundant number, since it is smaller than the sum of its proper divisors (822923494974).

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

642556700946 is a wasteful number, since it uses less digits than its factorization.

642556700946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1878820790 (or 1878820787 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 54.

It can be divided in two parts, 64255 and 6700946, that added together give a 4-th power (6765201 = 51⁴).

The spelling of 642556700946 in words is "six hundred forty-two billion, five hundred fifty-six million, seven hundred thousand, nine hundred forty-six".