72849342697921 has 2 divisors, whose sum is σ = 72849342697922. Its totient is φ = 72849342697920.

The previous prime is 72849342697897. The next prime is 72849342697951. The reversal of 72849342697921 is 12979624394827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72432627261696 + 416715436225 = 8510736^2 + 645535^2 .

It is a cyclic number.

It is not a de Polignac number, because 72849342697921 - 2²⁵ = 72849309143489 is a prime.

It is not a weakly prime, because it can be changed into another prime (72849342697951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36424671348960 + 36424671348961.

It is an arithmetic number, because the mean of its divisors is an integer number (36424671348961).

Almost surely, 2^{72849342697921} is an apocalyptic number.

It is an amenable number.

72849342697921 is a deficient number, since it is larger than the sum of its proper divisors (1).

72849342697921 is an equidigital number, since it uses as much as digits as its factorization.

72849342697921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 658409472, while the sum is 73.

The spelling of 72849342697921 in words is "seventy-two trillion, eight hundred forty-nine billion, three hundred forty-two million, six hundred ninety-seven thousand, nine hundred twenty-one".