72540740610997 has 2 divisors, whose sum is σ = 72540740610998. Its totient is φ = 72540740610996.

The previous prime is 72540740610929. The next prime is 72540740611033. The reversal of 72540740610997 is 79901604704527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46252499244561 + 26288241366436 = 6800919^2 + 5127206^2 .

It is a cyclic number.

It is not a de Polignac number, because 72540740610997 - 2²³ = 72540732222389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72540740610097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36270370305498 + 36270370305499.

It is an arithmetic number, because the mean of its divisors is an integer number (36270370305499).

Almost surely, 2^{72540740610997} is an apocalyptic number.

It is an amenable number.

72540740610997 is a deficient number, since it is larger than the sum of its proper divisors (1).

72540740610997 is an equidigital number, since it uses as much as digits as its factorization.

72540740610997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26671680, while the sum is 61.

The spelling of 72540740610997 in words is "seventy-two trillion, five hundred forty billion, seven hundred forty million, six hundred ten thousand, nine hundred ninety-seven".