91658407669 has 2 divisors, whose sum is σ = 91658407670. Its totient is φ = 91658407668.

The previous prime is 91658407571. The next prime is 91658407693. The reversal of 91658407669 is 96670485619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91498385169 + 160022500 = 302487^2 + 12650^2 .

It is an emirp because it is prime and its reverse (96670485619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91658407669 - 2¹³ = 91658399477 is a prime.

It is a super-2 number, since 2×91658407669² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91658407069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45829203834 + 45829203835.

It is an arithmetic number, because the mean of its divisors is an integer number (45829203835).

Almost surely, 2^91658407669 is an apocalyptic number.

It is an amenable number.

91658407669 is a deficient number, since it is larger than the sum of its proper divisors (1).

91658407669 is an equidigital number, since it uses as much as digits as its factorization.

91658407669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19595520, while the sum is 61.

The spelling of 91658407669 in words is "ninety-one billion, six hundred fifty-eight million, four hundred seven thousand, six hundred sixty-nine".