72707426321 has 2 divisors, whose sum is σ = 72707426322. Its totient is φ = 72707426320.

The previous prime is 72707426227. The next prime is 72707426333. The reversal of 72707426321 is 12362470727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58617736321 + 14089690000 = 242111^2 + 118700^2 .

It is an emirp because it is prime and its reverse (12362470727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72707426321 - 2¹⁴ = 72707409937 is a prime.

It is not a weakly prime, because it can be changed into another prime (72707426371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36353713160 + 36353713161.

It is an arithmetic number, because the mean of its divisors is an integer number (36353713161).

Almost surely, 2^72707426321 is an apocalyptic number.

It is an amenable number.

72707426321 is a deficient number, since it is larger than the sum of its proper divisors (1).

72707426321 is an equidigital number, since it uses as much as digits as its factorization.

72707426321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 41.

The spelling of 72707426321 in words is "seventy-two billion, seven hundred seven million, four hundred twenty-six thousand, three hundred twenty-one".