2157875370665 has 32 divisors (see below), whose sum is σ = 3037932158976. Its totient is φ = 1440627168960.

The previous prime is 2157875370659. The next prime is 2157875370683. The reversal of 2157875370665 is 5660735787512.

It is not a de Polignac number, because 2157875370665 - 2²⁰ = 2157874322089 is a prime.

It is a super-2 number, since 2×2157875370665² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2157875370598 and 2157875370607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1837097 + ... + 2773206.

It is an arithmetic number, because the mean of its divisors is an integer number (94935379968).

Almost surely, 2^{2157875370665} is an apocalyptic number.

It is an amenable number.

2157875370665 is a deficient number, since it is larger than the sum of its proper divisors (880056788311).

2157875370665 is a wasteful number, since it uses less digits than its factorization.

2157875370665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4610669.

The product of its (nonzero) digits is 74088000, while the sum is 62.

The spelling of 2157875370665 in words is "two trillion, one hundred fifty-seven billion, eight hundred seventy-five million, three hundred seventy thousand, six hundred sixty-five".