661244972 has 12 divisors (see below), whose sum is σ = 1160404560. Its totient is φ = 329700816.

The previous prime is 661244873. The next prime is 661245047. The reversal of 661244972 is 279442166.

661244972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228803 + ... + 231674.

It is an arithmetic number, because the mean of its divisors is an integer number (96700380).

Almost surely, 2^661244972 is an apocalyptic number.

It is an amenable number.

661244972 is a deficient number, since it is larger than the sum of its proper divisors (499159588).

661244972 is a wasteful number, since it uses less digits than its factorization.

661244972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460840 (or 460838 counting only the distinct ones).

The product of its digits is 145152, while the sum is 41.

The square root of 661244972 is about 25714.6839762809. The cubic root of 661244972 is about 871.2058726253.

The spelling of 661244972 in words is "six hundred sixty-one million, two hundred forty-four thousand, nine hundred seventy-two".