79944809491 has 2 divisors, whose sum is σ = 79944809492. Its totient is φ = 79944809490.

The previous prime is 79944809459. The next prime is 79944809537. The reversal of 79944809491 is 19490844997.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79944809491 - 2⁵ = 79944809459 is a prime.

It is not a weakly prime, because it can be changed into another prime (79944809411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39972404745 + 39972404746.

It is an arithmetic number, because the mean of its divisors is an integer number (39972404746).

Almost surely, 2^79944809491 is an apocalyptic number.

79944809491 is a deficient number, since it is larger than the sum of its proper divisors (1).

79944809491 is an equidigital number, since it uses as much as digits as its factorization.

79944809491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23514624, while the sum is 64.

The spelling of 79944809491 in words is "seventy-nine billion, nine hundred forty-four million, eight hundred nine thousand, four hundred ninety-one".