115691251666 has 32 divisors (see below), whose sum is σ = 176787007488. Its totient is φ = 56772155520.

The previous prime is 115691251661. The next prime is 115691251673. The reversal of 115691251666 is 666152196511.

It is not an unprimeable number, because it can be changed into a prime (115691251661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43054575 + ... + 43057261.

It is an arithmetic number, because the mean of its divisors is an integer number (5524593984).

Almost surely, 2^115691251666 is an apocalyptic number.

115691251666 is a deficient number, since it is larger than the sum of its proper divisors (61095755822).

115691251666 is a wasteful number, since it uses less digits than its factorization.

115691251666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4386.

The product of its digits is 583200, while the sum is 49.

The spelling of 115691251666 in words is "one hundred fifteen billion, six hundred ninety-one million, two hundred fifty-one thousand, six hundred sixty-six".