91869745651 has 2 divisors, whose sum is σ = 91869745652. Its totient is φ = 91869745650.

The previous prime is 91869745621. The next prime is 91869745657. The reversal of 91869745651 is 15654796819.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91869745651 - 2⁹ = 91869745139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91869745651.

It is not a weakly prime, because it can be changed into another prime (91869745657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45934872825 + 45934872826.

It is an arithmetic number, because the mean of its divisors is an integer number (45934872826).

Almost surely, 2^91869745651 is an apocalyptic number.

91869745651 is a deficient number, since it is larger than the sum of its proper divisors (1).

91869745651 is an equidigital number, since it uses as much as digits as its factorization.

91869745651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16329600, while the sum is 61.

The spelling of 91869745651 in words is "ninety-one billion, eight hundred sixty-nine million, seven hundred forty-five thousand, six hundred fifty-one".