91666927501 has 4 divisors (see below), whose sum is σ = 95652446112. Its totient is φ = 87681408892.

The previous prime is 91666927481. The next prime is 91666927507. The reversal of 91666927501 is 10572966619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91666927501 - 2²¹ = 91664830349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91666927507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1992759271 + ... + 1992759316.

It is an arithmetic number, because the mean of its divisors is an integer number (23913111528).

Almost surely, 2^91666927501 is an apocalyptic number.

It is an amenable number.

91666927501 is a deficient number, since it is larger than the sum of its proper divisors (3985518611).

91666927501 is a wasteful number, since it uses less digits than its factorization.

91666927501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3985518610.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 91666927501 in words is "ninety-one billion, six hundred sixty-six million, nine hundred twenty-seven thousand, five hundred one".