1661322572 has 24 divisors (see below), whose sum is σ = 3578234016. Its totient is φ = 657226368.

The previous prime is 1661322541. The next prime is 1661322601. The reversal of 1661322572 is 2752231661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2281673 + ... + 2282400.

It is an arithmetic number, because the mean of its divisors is an integer number (149093084).

Almost surely, 2^1661322572 is an apocalyptic number.

It is an amenable number.

1661322572 is an abundant number, since it is smaller than the sum of its proper divisors (1916911444).

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

1661322572 is a wasteful number, since it uses less digits than its factorization.

1661322572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4564097 (or 4564095 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 1661322572 is about 40759.3249698765. The cubic root of 1661322572 is about 1184.3625196755.

The spelling of 1661322572 in words is "one billion, six hundred sixty-one million, three hundred twenty-two thousand, five hundred seventy-two".