72397699697 has 2 divisors, whose sum is σ = 72397699698. Its totient is φ = 72397699696.

The previous prime is 72397699691. The next prime is 72397699727. The reversal of 72397699697 is 79699679327.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55587021361 + 16810678336 = 235769^2 + 129656^2 .

It is a cyclic number.

It is not a de Polignac number, because 72397699697 - 2⁸ = 72397699441 is a prime.

It is not a weakly prime, because it can be changed into another prime (72397699691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36198849848 + 36198849849.

It is an arithmetic number, because the mean of its divisors is an integer number (36198849849).

Almost surely, 2^72397699697 is an apocalyptic number.

It is an amenable number.

72397699697 is a deficient number, since it is larger than the sum of its proper divisors (1).

72397699697 is an equidigital number, since it uses as much as digits as its factorization.

72397699697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486091368, while the sum is 74.

The spelling of 72397699697 in words is "seventy-two billion, three hundred ninety-seven million, six hundred ninety-nine thousand, six hundred ninety-seven".