91936662787 has 2 divisors, whose sum is σ = 91936662788. Its totient is φ = 91936662786.

The previous prime is 91936662767. The next prime is 91936662803. The reversal of 91936662787 is 78726663919.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91936662787 - 2⁷ = 91936662659 is a prime.

It is not a weakly prime, because it can be changed into another prime (91936662767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45968331393 + 45968331394.

It is an arithmetic number, because the mean of its divisors is an integer number (45968331394).

Almost surely, 2^91936662787 is an apocalyptic number.

91936662787 is a deficient number, since it is larger than the sum of its proper divisors (1).

91936662787 is an equidigital number, since it uses as much as digits as its factorization.

91936662787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41150592, while the sum is 64.

The spelling of 91936662787 in words is "ninety-one billion, nine hundred thirty-six million, six hundred sixty-two thousand, seven hundred eighty-seven".