665607613722 has 64 divisors (see below), whose sum is σ = 1373312102400. Its totient is φ = 214933910400.

The previous prime is 665607613717. The next prime is 665607613739. The reversal of 665607613722 is 227316706566.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24610347 + ... + 24637377.

It is an arithmetic number, because the mean of its divisors is an integer number (21458001600).

Almost surely, 2^665607613722 is an apocalyptic number.

665607613722 is an abundant number, since it is smaller than the sum of its proper divisors (707704488678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665607613722 is a wasteful number, since it uses less digits than its factorization.

665607613722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27779.

The product of its (nonzero) digits is 3810240, while the sum is 51.

The spelling of 665607613722 in words is "six hundred sixty-five billion, six hundred seven million, six hundred thirteen thousand, seven hundred twenty-two".