20151968013 has 6 divisors (see below), whose sum is σ = 29108398254. Its totient is φ = 13434645336.

The previous prime is 20151967981. The next prime is 20151968041. The reversal of 20151968013 is 31086915102.

It can be written as a sum of positive squares in only one way, i.e., 13280718564 + 6871249449 = 115242^2 + 82893^2 .

It is not a de Polignac number, because 20151968013 - 2⁵ = 20151967981 is a prime.

It is a super-2 number, since 2×20151968013² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20151968093) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1119553770 + ... + 1119553787.

It is an arithmetic number, because the mean of its divisors is an integer number (4851399709).

Almost surely, 2^20151968013 is an apocalyptic number.

It is an amenable number.

20151968013 is a deficient number, since it is larger than the sum of its proper divisors (8956430241).

20151968013 is a wasteful number, since it uses less digits than its factorization.

20151968013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2239107563 (or 2239107560 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The spelling of 20151968013 in words is "twenty billion, one hundred fifty-one million, nine hundred sixty-eight thousand, thirteen".