91511666001 has 64 divisors (see below), whose sum is σ = 163724083200. Its totient is φ = 49385464128.

The previous prime is 91511665963. The next prime is 91511666011. The reversal of 91511666001 is 10066611519.

91511666001 = 23761² + 23762² + ... + 23921².

It is not a de Polignac number, because 91511666001 - 2⁶ = 91511665937 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91511666011) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 210175 + ... + 476651.

It is an arithmetic number, because the mean of its divisors is an integer number (2558188800).

Almost surely, 2^91511666001 is an apocalyptic number.

It is an amenable number.

91511666001 is a deficient number, since it is larger than the sum of its proper divisors (72212417199).

91511666001 is a wasteful number, since it uses less digits than its factorization.

91511666001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266595 (or 266589 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The spelling of 91511666001 in words is "ninety-one billion, five hundred eleven million, six hundred sixty-six thousand, one".