91666666761 has 4 divisors (see below), whose sum is σ = 122222222352. Its totient is φ = 61111111172.

The previous prime is 91666666711. The next prime is 91666666787. The reversal of 91666666761 is 16766666619.

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 91666666761 - 2¹⁰ = 91666665737 is a prime.

It is a super-2 number, since 2×91666666761² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91666666695 and 91666666704.

It is not an unprimeable number, because it can be changed into a prime (91666666711) 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 3 ways as a sum of consecutive naturals, for example, 15277777791 + ... + 15277777796.

It is an arithmetic number, because the mean of its divisors is an integer number (30555555588).

Almost surely, 2^91666666761 is an apocalyptic number.

It is an amenable number.

91666666761 is a deficient number, since it is larger than the sum of its proper divisors (30555555591).

91666666761 is a wasteful number, since it uses less digits than its factorization.

91666666761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30555555590.

The product of its digits is 17635968, while the sum is 60.

The spelling of 91666666761 in words is "ninety-one billion, six hundred sixty-six million, six hundred sixty-six thousand, seven hundred sixty-one".