72322731657 has 16 divisors (see below), whose sum is σ = 116885223360. Its totient is φ = 43831958400.

The previous prime is 72322731641. The next prime is 72322731667. The reversal of 72322731657 is 75613722327.

It is a happy number.

72322731657 is a `hidden beast` number, since 7 + 2 + 322 + 7 + 316 + 5 + 7 = 666.

It is not a de Polignac number, because 72322731657 - 2⁴ = 72322731641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72322731667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121755144 + ... + 121755737.

It is an arithmetic number, because the mean of its divisors is an integer number (7305326460).

Almost surely, 2^72322731657 is an apocalyptic number.

It is an amenable number.

72322731657 is a deficient number, since it is larger than the sum of its proper divisors (44562491703).

72322731657 is a wasteful number, since it uses less digits than its factorization.

72322731657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243510901 (or 243510895 counting only the distinct ones).

The product of its digits is 740880, while the sum is 45.

The spelling of 72322731657 in words is "seventy-two billion, three hundred twenty-two million, seven hundred thirty-one thousand, six hundred fifty-seven".