72731197507 has 2 divisors, whose sum is σ = 72731197508. Its totient is φ = 72731197506.

The previous prime is 72731197417. The next prime is 72731197523. The reversal of 72731197507 is 70579113727.

It is a strong prime.

It is an emirp because it is prime and its reverse (70579113727) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72731197507 is a prime.

It is not a weakly prime, because it can be changed into another prime (72731197577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36365598753 + 36365598754.

It is an arithmetic number, because the mean of its divisors is an integer number (36365598754).

Almost surely, 2^72731197507 is an apocalyptic number.

72731197507 is a deficient number, since it is larger than the sum of its proper divisors (1).

72731197507 is an equidigital number, since it uses as much as digits as its factorization.

72731197507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648270, while the sum is 49.

The spelling of 72731197507 in words is "seventy-two billion, seven hundred thirty-one million, one hundred ninety-seven thousand, five hundred seven".