2157078065 has 32 divisors (see below), whose sum is σ = 2790837504. Its totient is φ = 1594644480.

The previous prime is 2157078061. The next prime is 2157078083. The reversal of 2157078065 is 5608707512.

It is not a de Polignac number, because 2157078065 - 2² = 2157078061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2157078061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2966732 + ... + 2967458.

It is an arithmetic number, because the mean of its divisors is an integer number (87213672).

Almost surely, 2^2157078065 is an apocalyptic number.

It is an amenable number.

2157078065 is a deficient number, since it is larger than the sum of its proper divisors (633759439).

2157078065 is a wasteful number, since it uses less digits than its factorization.

2157078065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337.

The product of its (nonzero) digits is 117600, while the sum is 41.

The square root of 2157078065 is about 46444.3545008433. The cubic root of 2157078065 is about 1292.0776696830.

The spelling of 2157078065 in words is "two billion, one hundred fifty-seven million, seventy-eight thousand, sixty-five".