661258970 has 48 divisors (see below), whose sum is σ = 1258820352. Its totient is φ = 249622560.

The previous prime is 661258943. The next prime is 661259003. The reversal of 661258970 is 79852166.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2439935 + ... + 2440205.

It is an arithmetic number, because the mean of its divisors is an integer number (26225424).

Almost surely, 2^661258970 is an apocalyptic number.

661258970 is a deficient number, since it is larger than the sum of its proper divisors (597561382).

661258970 is a wasteful number, since it uses less digits than its factorization.

661258970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 661258970 is about 25714.9561539583. The cubic root of 661258970 is about 871.2120201472.

The spelling of 661258970 in words is "six hundred sixty-one million, two hundred fifty-eight thousand, nine hundred seventy".