715205257721 has 16 divisors (see below), whose sum is σ = 777709175040. Its totient is φ = 655131705600.

The previous prime is 715205257717. The next prime is 715205257751. The reversal of 715205257721 is 127752502517.

It is a happy number.

715205257721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 715205257721 - 2² = 715205257717 is a prime.

It is a super-2 number, since 2×715205257721² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (715205257751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2357330 + ... + 2643371.

It is an arithmetic number, because the mean of its divisors is an integer number (48606823440).

Almost surely, 2^715205257721 is an apocalyptic number.

It is an amenable number.

715205257721 is a deficient number, since it is larger than the sum of its proper divisors (62503917319).

715205257721 is a wasteful number, since it uses less digits than its factorization.

715205257721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5000944.

The product of its (nonzero) digits is 343000, while the sum is 44.

The spelling of 715205257721 in words is "seven hundred fifteen billion, two hundred five million, two hundred fifty-seven thousand, seven hundred twenty-one".