715221661 has 16 divisors (see below), whose sum is σ = 903927168. Its totient is φ = 549676800.

The previous prime is 715221653. The next prime is 715221667. The reversal of 715221661 is 166122517.

715221661 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 715221661 - 2³ = 715221653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (715221667) 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, 58000 + ... + 69241.

It is an arithmetic number, because the mean of its divisors is an integer number (56495448).

Almost surely, 2^715221661 is an apocalyptic number.

It is an amenable number.

715221661 is a deficient number, since it is larger than the sum of its proper divisors (188705507).

715221661 is a wasteful number, since it uses less digits than its factorization.

715221661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127332.

The product of its digits is 5040, while the sum is 31.

The square root of 715221661 is about 26743.6284187468. The cubic root of 715221661 is about 894.2937995241.

The spelling of 715221661 in words is "seven hundred fifteen million, two hundred twenty-one thousand, six hundred sixty-one".