72356557237 has 2 divisors, whose sum is σ = 72356557238. Its totient is φ = 72356557236.

The previous prime is 72356557183. The next prime is 72356557277. The reversal of 72356557237 is 73275565327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37405880836 + 34950676401 = 193406^2 + 186951^2 .

It is an emirp because it is prime and its reverse (73275565327) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72356557237 - 2¹⁵ = 72356524469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72356557277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36178278618 + 36178278619.

It is an arithmetic number, because the mean of its divisors is an integer number (36178278619).

Almost surely, 2^72356557237 is an apocalyptic number.

It is an amenable number.

72356557237 is a deficient number, since it is larger than the sum of its proper divisors (1).

72356557237 is an equidigital number, since it uses as much as digits as its factorization.

72356557237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9261000, while the sum is 52.

The spelling of 72356557237 in words is "seventy-two billion, three hundred fifty-six million, five hundred fifty-seven thousand, two hundred thirty-seven".