72909409537 has 2 divisors, whose sum is σ = 72909409538. Its totient is φ = 72909409536.

The previous prime is 72909409471. The next prime is 72909409577. The reversal of 72909409537 is 73590490927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42393162816 + 30516246721 = 205896^2 + 174689^2 .

It is a cyclic number.

It is not a de Polignac number, because 72909409537 - 2¹¹ = 72909407489 is a prime.

It is not a weakly prime, because it can be changed into another prime (72909409577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36454704768 + 36454704769.

It is an arithmetic number, because the mean of its divisors is an integer number (36454704769).

Almost surely, 2^72909409537 is an apocalyptic number.

It is an amenable number.

72909409537 is a deficient number, since it is larger than the sum of its proper divisors (1).

72909409537 is an equidigital number, since it uses as much as digits as its factorization.

72909409537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4286520, while the sum is 55.

The spelling of 72909409537 in words is "seventy-two billion, nine hundred nine million, four hundred nine thousand, five hundred thirty-seven".