642187875165 has 16 divisors (see below), whose sum is σ = 1027516155648. Its totient is φ = 342495014976.

The previous prime is 642187875127. The next prime is 642187875227. The reversal of 642187875165 is 561578781246.

It is not a de Polignac number, because 642187875165 - 2⁷ = 642187875037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642187875099 and 642187875108.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 833052 + ... + 1406538.

It is an arithmetic number, because the mean of its divisors is an integer number (64219759728).

Almost surely, 2^642187875165 is an apocalyptic number.

It is an amenable number.

642187875165 is a deficient number, since it is larger than the sum of its proper divisors (385328280483).

642187875165 is a wasteful number, since it uses less digits than its factorization.

642187875165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648148.

The product of its digits is 22579200, while the sum is 60.

The spelling of 642187875165 in words is "six hundred forty-two billion, one hundred eighty-seven million, eight hundred seventy-five thousand, one hundred sixty-five".