101991292078 has 16 divisors (see below), whose sum is σ = 166213179216. Its totient is φ = 46656328320.

The previous prime is 101991292061. The next prime is 101991292087. The reversal of 101991292078 is 870292199101.

It is a happy number.

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, 17354328 + ... + 17360203.

It is an arithmetic number, because the mean of its divisors is an integer number (10388323701).

Almost surely, 2^101991292078 is an apocalyptic number.

101991292078 is a deficient number, since it is larger than the sum of its proper divisors (64221887138).

101991292078 is a wasteful number, since it uses less digits than its factorization.

101991292078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34714659.

The product of its (nonzero) digits is 163296, while the sum is 49.

The spelling of 101991292078 in words is "one hundred one billion, nine hundred ninety-one million, two hundred ninety-two thousand, seventy-eight".