661479970 has 16 divisors (see below), whose sum is σ = 1191139200. Its totient is φ = 264486384.

The previous prime is 661479943. The next prime is 661479991. The reversal of 661479970 is 79974166.

It is a super-2 number, since 2×661479970² = 875111501422401800, which contains 22 as substring.

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, 16231 + ... + 39829.

It is an arithmetic number, because the mean of its divisors is an integer number (74446200).

Almost surely, 2^661479970 is an apocalyptic number.

661479970 is a deficient number, since it is larger than the sum of its proper divisors (529659230).

661479970 is a wasteful number, since it uses less digits than its factorization.

661479970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26409.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 661479970 is about 25719.2529051681. The cubic root of 661479970 is about 871.3090655408.

The spelling of 661479970 in words is "six hundred sixty-one million, four hundred seventy-nine thousand, nine hundred seventy".