111661406 has 16 divisors (see below), whose sum is σ = 177772320. Its totient is φ = 52419840.

The previous prime is 111661399. The next prime is 111661441. The reversal of 111661406 is 604166111.

It is a congruent number.

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, 11186 + ... + 18666.

It is an arithmetic number, because the mean of its divisors is an integer number (11110770).

Almost surely, 2^111661406 is an apocalyptic number.

111661406 is a deficient number, since it is larger than the sum of its proper divisors (66110914).

111661406 is a wasteful number, since it uses less digits than its factorization.

111661406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7939.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 111661406 is about 10566.9960726784. The cubic root of 111661406 is about 481.5422126841.

The spelling of 111661406 in words is "one hundred eleven million, six hundred sixty-one thousand, four hundred six".