2015665251 has 16 divisors (see below), whose sum is σ = 2715406848. Its totient is φ = 1329876000.

The previous prime is 2015665219. The next prime is 2015665259. The reversal of 2015665251 is 1525665102.

It is not a de Polignac number, because 2015665251 - 2⁵ = 2015665219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2015665259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 392601 + ... + 397701.

It is an arithmetic number, because the mean of its divisors is an integer number (169712928).

Almost surely, 2^2015665251 is an apocalyptic number.

2015665251 is a deficient number, since it is larger than the sum of its proper divisors (699741597).

2015665251 is a wasteful number, since it uses less digits than its factorization.

2015665251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6442.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 2015665251 is about 44896.1607601363. The cubic root of 2015665251 is about 1263.2019951894.

The spelling of 2015665251 in words is "two billion, fifteen million, six hundred sixty-five thousand, two hundred fifty-one".