2157607565 has 8 divisors (see below), whose sum is σ = 2598279648. Its totient is φ = 1719985680.

The previous prime is 2157607559. The next prime is 2157607579. The reversal of 2157607565 is 5657067512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2157607565 - 2⁴ = 2157607549 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 760991 + ... + 763820.

It is an arithmetic number, because the mean of its divisors is an integer number (324784956).

Almost surely, 2^2157607565 is an apocalyptic number.

It is an amenable number.

2157607565 is a deficient number, since it is larger than the sum of its proper divisors (440672083).

2157607565 is a wasteful number, since it uses less digits than its factorization.

2157607565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525099.

The product of its (nonzero) digits is 441000, while the sum is 44.

The square root of 2157607565 is about 46450.0545209583. The cubic root of 2157607565 is about 1292.1833835442.

The spelling of 2157607565 in words is "two billion, one hundred fifty-seven million, six hundred seven thousand, five hundred sixty-five".