72507382991 has 2 divisors, whose sum is σ = 72507382992. Its totient is φ = 72507382990.

The previous prime is 72507382979. The next prime is 72507383051. The reversal of 72507382991 is 19928370527.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72507382991 is a prime.

It is a super-2 number, since 2×72507382991² (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 (72507382291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36253691495 + 36253691496.

It is an arithmetic number, because the mean of its divisors is an integer number (36253691496).

Almost surely, 2^72507382991 is an apocalyptic number.

72507382991 is a deficient number, since it is larger than the sum of its proper divisors (1).

72507382991 is an equidigital number, since it uses as much as digits as its factorization.

72507382991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The spelling of 72507382991 in words is "seventy-two billion, five hundred seven million, three hundred eighty-two thousand, nine hundred ninety-one".