79044809477 has 2 divisors, whose sum is σ = 79044809478. Its totient is φ = 79044809476.

The previous prime is 79044809443. The next prime is 79044809491. The reversal of 79044809477 is 77490844097.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75647551681 + 3397257796 = 275041^2 + 58286^2 .

It is a cyclic number.

It is not a de Polignac number, because 79044809477 - 2¹² = 79044805381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79044809497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39522404738 + 39522404739.

It is an arithmetic number, because the mean of its divisors is an integer number (39522404739).

Almost surely, 2^79044809477 is an apocalyptic number.

It is an amenable number.

79044809477 is a deficient number, since it is larger than the sum of its proper divisors (1).

79044809477 is an equidigital number, since it uses as much as digits as its factorization.

79044809477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14224896, while the sum is 59.

The spelling of 79044809477 in words is "seventy-nine billion, forty-four million, eight hundred nine thousand, four hundred seventy-seven".