665715722 has 16 divisors (see below), whose sum is σ = 1162760832. Its totient is φ = 279923280.

The previous prime is 665715719. The next prime is 665715763. The reversal of 665715722 is 227517566.

It is a self number, because there is not a number n which added to its sum of digits gives 665715722.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447854 + ... + 449337.

It is an arithmetic number, because the mean of its divisors is an integer number (72672552).

Almost surely, 2^665715722 is an apocalyptic number.

665715722 is a deficient number, since it is larger than the sum of its proper divisors (497045110).

665715722 is a wasteful number, since it uses less digits than its factorization.

665715722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897253.

The product of its digits is 176400, while the sum is 41.

The square root of 665715722 is about 25801.4674388880. The cubic root of 665715722 is about 873.1649037439.

The spelling of 665715722 in words is "six hundred sixty-five million, seven hundred fifteen thousand, seven hundred twenty-two".