91685092190557 has 2 divisors, whose sum is σ = 91685092190558. Its totient is φ = 91685092190556.

The previous prime is 91685092190473. The next prime is 91685092190561. The reversal of 91685092190557 is 75509129058619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90579931987801 + 1105160202756 = 9517349^2 + 1051266^2 .

It is a cyclic number.

It is not a de Polignac number, because 91685092190557 - 2¹¹ = 91685092188509 is a prime.

It is a super-2 number, since 2×91685092190557² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91685092190492 and 91685092190501.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45842546095278 + 45842546095279.

It is an arithmetic number, because the mean of its divisors is an integer number (45842546095279).

Almost surely, 2^{91685092190557} is an apocalyptic number.

It is an amenable number.

91685092190557 is a deficient number, since it is larger than the sum of its proper divisors (1).

91685092190557 is an equidigital number, since it uses as much as digits as its factorization.

91685092190557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61236000, while the sum is 67.

The spelling of 91685092190557 in words is "ninety-one trillion, six hundred eighty-five billion, ninety-two million, one hundred ninety thousand, five hundred fifty-seven".