13661879056 has 40 divisors (see below), whose sum is σ = 31227160064. Its totient is φ = 5666215680.

The previous prime is 13661879039. The next prime is 13661879057. The reversal of 13661879056 is 65097816631.

It is a happy number.

It is a super-2 number, since 2×13661879056² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13661878994 and 13661879012.

It is not an unprimeable number, because it can be changed into a prime (13661879057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1963965 + ... + 1970908.

Almost surely, 2^13661879056 is an apocalyptic number.

13661879056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13661879056 is an abundant number, since it is smaller than the sum of its proper divisors (17565281008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13661879056 is a wasteful number, since it uses less digits than its factorization.

13661879056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3934919 (or 3934913 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 13661879056 in words is "thirteen billion, six hundred sixty-one million, eight hundred seventy-nine thousand, fifty-six".