642155607 has 40 divisors (see below), whose sum is σ = 1033359360. Its totient is φ = 396245520.

The previous prime is 642155567. The next prime is 642155611. The reversal of 642155607 is 706551246.

It is a happy number.

642155607 is a `hidden beast` number, since 6 + 42 + 1 + 5 + 5 + 607 = 666.

It is not a de Polignac number, because 642155607 - 2¹¹ = 642153559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642156607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 52194 + ... + 63312.

It is an arithmetic number, because the mean of its divisors is an integer number (25833984).

Almost surely, 2^642155607 is an apocalyptic number.

642155607 is a deficient number, since it is larger than the sum of its proper divisors (391203753).

642155607 is a wasteful number, since it uses less digits than its factorization.

642155607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11185 (or 11176 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 642155607 is about 25340.7893918086. The cubic root of 642155607 is about 862.7403156441.

The spelling of 642155607 in words is "six hundred forty-two million, one hundred fifty-five thousand, six hundred seven".