72974369549 has 2 divisors, whose sum is σ = 72974369550. Its totient is φ = 72974369548.

The previous prime is 72974369543. The next prime is 72974369557. The reversal of 72974369549 is 94596347927.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72967515625 + 6853924 = 270125^2 + 2618^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72974369549 is a prime.

It is a super-2 number, since 2×72974369549² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72974369543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36487184774 + 36487184775.

It is an arithmetic number, because the mean of its divisors is an integer number (36487184775).

Almost surely, 2^72974369549 is an apocalyptic number.

It is an amenable number.

72974369549 is a deficient number, since it is larger than the sum of its proper divisors (1).

72974369549 is an equidigital number, since it uses as much as digits as its factorization.

72974369549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102876480, while the sum is 65.

The spelling of 72974369549 in words is "seventy-two billion, nine hundred seventy-four million, three hundred sixty-nine thousand, five hundred forty-nine".