13115666642 has 16 divisors (see below), whose sum is σ = 21313720512. Its totient is φ = 6017134800.

The previous prime is 13115666593. The next prime is 13115666657. The reversal of 13115666642 is 24666651131.

It is a super-2 number, since 2×13115666642² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13115666642.

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, 1505984 + ... + 1514667.

It is an arithmetic number, because the mean of its divisors is an integer number (1332107532).

Almost surely, 2^13115666642 is an apocalyptic number.

13115666642 is a deficient number, since it is larger than the sum of its proper divisors (8198053870).

13115666642 is a wasteful number, since it uses less digits than its factorization.

13115666642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3020833.

The product of its digits is 155520, while the sum is 41.

The spelling of 13115666642 in words is "thirteen billion, one hundred fifteen million, six hundred sixty-six thousand, six hundred forty-two".