11111561616 has 20 divisors (see below), whose sum is σ = 28704867632. Its totient is φ = 3703853856.

The previous prime is 11111561581. The next prime is 11111561639. The reversal of 11111561616 is 61616511111.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115745386 + ... + 115745481.

Almost surely, 2^11111561616 is an apocalyptic number.

11111561616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11111561616 is an abundant number, since it is smaller than the sum of its proper divisors (17593306016).

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

11111561616 is a wasteful number, since it uses less digits than its factorization.

11111561616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231490878 (or 231490872 counting only the distinct ones).

The product of its digits is 1080, while the sum is 30.

The spelling of 11111561616 in words is "eleven billion, one hundred eleven million, five hundred sixty-one thousand, six hundred sixteen".