661254210 has 48 divisors (see below), whose sum is σ = 1720742400. Its totient is φ = 176182560.

The previous prime is 661254203. The next prime is 661254227. The reversal of 661254210 is 12452166.

661254210 is a `hidden beast` number, since 6 + 612 + 5 + 42 + 1 + 0 = 666.

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, 135391 + ... + 140189.

It is an arithmetic number, because the mean of its divisors is an integer number (35848800).

Almost surely, 2^661254210 is an apocalyptic number.

661254210 is an abundant number, since it is smaller than the sum of its proper divisors (1059488190).

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

661254210 is a wasteful number, since it uses less digits than its factorization.

661254210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6343 (or 6340 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 661254210 is about 25714.8636006493. The cubic root of 661254210 is about 871.2099297009.

The spelling of 661254210 in words is "six hundred sixty-one million, two hundred fifty-four thousand, two hundred ten".