91445759977 has 8 divisors (see below), whose sum is σ = 107432781120. Its totient is φ = 76737700560.

The previous prime is 91445759971. The next prime is 91445759981. The reversal of 91445759977 is 77995754419.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91445759977 is a prime.

It is a super-3 number, since 3×91445759977³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91445759971) 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, 319740277 + ... + 319740562.

It is an arithmetic number, because the mean of its divisors is an integer number (13429097640).

Almost surely, 2^91445759977 is an apocalyptic number.

It is an amenable number.

91445759977 is a deficient number, since it is larger than the sum of its proper divisors (15987021143).

91445759977 is a wasteful number, since it uses less digits than its factorization.

91445759977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639480863.

The product of its digits is 100018800, while the sum is 67.

The spelling of 91445759977 in words is "ninety-one billion, four hundred forty-five million, seven hundred fifty-nine thousand, nine hundred seventy-seven".