215116441661 has 24 divisors (see below), whose sum is σ = 250004344800. Its totient is φ = 183528518400.

The previous prime is 215116441651. The next prime is 215116441697. The reversal of 215116441661 is 166144611512.

It is a de Polignac number, because none of the positive numbers 2^k-215116441661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215116441651) 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, 1012526 + ... + 1206416.

It is an arithmetic number, because the mean of its divisors is an integer number (10416847700).

Almost surely, 2^215116441661 is an apocalyptic number.

It is an amenable number.

215116441661 is a deficient number, since it is larger than the sum of its proper divisors (34887903139).

215116441661 is a wasteful number, since it uses less digits than its factorization.

215116441661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194285 (or 194268 counting only the distinct ones).

The product of its digits is 34560, while the sum is 38.

The spelling of 215116441661 in words is "two hundred fifteen billion, one hundred sixteen million, four hundred forty-one thousand, six hundred sixty-one".