664545473722 has 24 divisors (see below), whose sum is σ = 1079967315420. Its totient is φ = 306550632960.

The previous prime is 664545473719. The next prime is 664545473747. The reversal of 664545473722 is 227374545466.

It can be written as a sum of positive squares in 6 ways, for example, as 11388944961 + 653156528761 = 106719^2 + 808181^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118072 + ... + 1158892.

Almost surely, 2^664545473722 is an apocalyptic number.

664545473722 is a deficient number, since it is larger than the sum of its proper divisors (415421841698).

664545473722 is a wasteful number, since it uses less digits than its factorization.

664545473722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042738 (or 1042725 counting only the distinct ones).

The product of its digits is 33868800, while the sum is 55.

It can be divided in two parts, 6645454 and 73722, that added together give a palindrome (6719176).

The spelling of 664545473722 in words is "six hundred sixty-four billion, five hundred forty-five million, four hundred seventy-three thousand, seven hundred twenty-two".