91377781915 has 8 divisors (see below), whose sum is σ = 125318100960. Its totient is φ = 62659050432.

The previous prime is 91377781909. The next prime is 91377781951. The reversal of 91377781915 is 51918777319.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91377781915 - 2⁷ = 91377781787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91377781915.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1305396850 + ... + 1305396919.

It is an arithmetic number, because the mean of its divisors is an integer number (15664762620).

Almost surely, 2^91377781915 is an apocalyptic number.

91377781915 is a deficient number, since it is larger than the sum of its proper divisors (33940319045).

91377781915 is a wasteful number, since it uses less digits than its factorization.

91377781915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2610793781.

The product of its digits is 3333960, while the sum is 58.

The spelling of 91377781915 in words is "ninety-one billion, three hundred seventy-seven million, seven hundred eighty-one thousand, nine hundred fifteen".