91168651959 has 64 divisors (see below), whose sum is σ = 159594209280. Its totient is φ = 44885301120.

The previous prime is 91168651883. The next prime is 91168651997. The reversal of 91168651959 is 95915686119.

It is not a de Polignac number, because 91168651959 - 2¹³ = 91168643767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91168601959) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 500404 + ... + 657830.

It is an arithmetic number, because the mean of its divisors is an integer number (2493659520).

Almost surely, 2^91168651959 is an apocalyptic number.

91168651959 is a deficient number, since it is larger than the sum of its proper divisors (68425557321).

91168651959 is a wasteful number, since it uses less digits than its factorization.

91168651959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157580.

The product of its digits is 5248800, while the sum is 60.

The spelling of 91168651959 in words is "ninety-one billion, one hundred sixty-eight million, six hundred fifty-one thousand, nine hundred fifty-nine".