20151318657 has 24 divisors (see below), whose sum is σ = 27888891520. Its totient is φ = 12940387200.

The previous prime is 20151318613. The next prime is 20151318673. The reversal of 20151318657 is 75681315102.

It is not a de Polignac number, because 20151318657 - 2⁸ = 20151318401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20151318697) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 373107 + ... + 423687.

Almost surely, 2^20151318657 is an apocalyptic number.

It is an amenable number.

20151318657 is a deficient number, since it is larger than the sum of its proper divisors (7737572863).

20151318657 is an equidigital number, since it uses as much as digits as its factorization.

20151318657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50745 (or 50704 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 39.

The spelling of 20151318657 in words is "twenty billion, one hundred fifty-one million, three hundred eighteen thousand, six hundred fifty-seven".