91777077917 has 8 divisors (see below), whose sum is σ = 105127017600. Its totient is φ = 78486870384.

The previous prime is 91777077913. The next prime is 91777078037. The reversal of 91777077917 is 71977077719.

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 91777077917 - 2² = 91777077913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91777077917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91777077913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14929742 + ... + 14935887.

It is an arithmetic number, because the mean of its divisors is an integer number (13140877200).

Almost surely, 2^91777077917 is an apocalyptic number.

It is an amenable number.

91777077917 is a deficient number, since it is larger than the sum of its proper divisors (13349939683).

91777077917 is a wasteful number, since it uses less digits than its factorization.

91777077917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29866075.

The product of its (nonzero) digits is 9529569, while the sum is 62.

The spelling of 91777077917 in words is "ninety-one billion, seven hundred seventy-seven million, seventy-seven thousand, nine hundred seventeen".