642306555 has 96 divisors (see below), whose sum is σ = 1251065088. Its totient is φ = 302227200.

The previous prime is 642306527. The next prime is 642306557. The reversal of 642306555 is 555603246.

It is a happy number.

642306555 is a `hidden beast` number, since 642 + 3 + 0 + 6 + 5 + 5 + 5 = 666.

It is not a de Polignac number, because 642306555 - 2⁶ = 642306491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642306557) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3548565 + ... + 3548745.

It is an arithmetic number, because the mean of its divisors is an integer number (13031928).

Almost surely, 2^642306555 is an apocalyptic number.

642306555 is a deficient number, since it is larger than the sum of its proper divisors (608758533).

642306555 is a wasteful number, since it uses less digits than its factorization.

642306555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

The square root of 642306555 is about 25343.7675770593. The cubic root of 642306555 is about 862.8079102276.

The spelling of 642306555 in words is "six hundred forty-two million, three hundred six thousand, five hundred fifty-five".