79745732569 has 2 divisors, whose sum is σ = 79745732570. Its totient is φ = 79745732568.

The previous prime is 79745732557. The next prime is 79745732617. The reversal of 79745732569 is 96523754797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70590113344 + 9155619225 = 265688^2 + 95685^2 .

It is a cyclic number.

It is not a de Polignac number, because 79745732569 - 2⁵ = 79745732537 is a prime.

It is a super-2 number, since 2×79745732569² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 79745732569.

It is not a weakly prime, because it can be changed into another prime (79745732509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39872866284 + 39872866285.

It is an arithmetic number, because the mean of its divisors is an integer number (39872866285).

Almost surely, 2^79745732569 is an apocalyptic number.

It is an amenable number.

79745732569 is a deficient number, since it is larger than the sum of its proper divisors (1).

79745732569 is an equidigital number, since it uses as much as digits as its factorization.

79745732569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100018800, while the sum is 64.

The spelling of 79745732569 in words is "seventy-nine billion, seven hundred forty-five million, seven hundred thirty-two thousand, five hundred sixty-nine".