91666666759 has 4 divisors (see below), whose sum is σ = 91885442040. Its totient is φ = 91447891480.

The previous prime is 91666666711. The next prime is 91666666787. The reversal of 91666666759 is 95766666619.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91666666759 - 2¹¹ = 91666664711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91666666694 and 91666666703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91666666789) 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, 109387012 + ... + 109387849.

It is an arithmetic number, because the mean of its divisors is an integer number (22971360510).

Almost surely, 2^91666666759 is an apocalyptic number.

91666666759 is a deficient number, since it is larger than the sum of its proper divisors (218775281).

91666666759 is a wasteful number, since it uses less digits than its factorization.

91666666759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218775280.

The product of its digits is 132269760, while the sum is 67.

The spelling of 91666666759 in words is "ninety-one billion, six hundred sixty-six million, six hundred sixty-six thousand, seven hundred fifty-nine".