642652064550 has 72 divisors (see below), whose sum is σ = 1766745232824. Its totient is φ = 167388439680.

The previous prime is 642652064539. The next prime is 642652064569. The reversal of 642652064550 is 55460256246.

642652064550 is a `hidden beast` number, since 6 + 42 + 6 + 52 + 0 + 6 + 4 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 642652064496 and 642652064505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16586647 + ... + 16625346.

Almost surely, 2^642652064550 is an apocalyptic number.

642652064550 is an abundant number, since it is smaller than the sum of its proper divisors (1124093168274).

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

642652064550 is a wasteful number, since it uses less digits than its factorization.

642652064550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33212054 (or 33212046 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 45.

The spelling of 642652064550 in words is "six hundred forty-two billion, six hundred fifty-two million, sixty-four thousand, five hundred fifty".