747279972721 has 2 divisors, whose sum is σ = 747279972722. Its totient is φ = 747279972720.

The previous prime is 747279972697. The next prime is 747279972757. The reversal of 747279972721 is 127279972747.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 499051822096 + 248228150625 = 706436^2 + 498225^2 .

It is a cyclic number.

It is not a de Polignac number, because 747279972721 - 2¹¹ = 747279970673 is a prime.

It is not a weakly prime, because it can be changed into another prime (747279972121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 373639986360 + 373639986361.

It is an arithmetic number, because the mean of its divisors is an integer number (373639986361).

Almost surely, 2^747279972721 is an apocalyptic number.

It is an amenable number.

747279972721 is a deficient number, since it is larger than the sum of its proper divisors (1).

747279972721 is an equidigital number, since it uses as much as digits as its factorization.

747279972721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43563744, while the sum is 64.

The spelling of 747279972721 in words is "seven hundred forty-seven billion, two hundred seventy-nine million, nine hundred seventy-two thousand, seven hundred twenty-one".