661862204 has 12 divisors (see below), whose sum is σ = 1160763744. Its totient is φ = 330215424.

The previous prime is 661862167. The next prime is 661862209. The reversal of 661862204 is 402268166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661862209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176837 + ... + 180540.

It is an arithmetic number, because the mean of its divisors is an integer number (96730312).

Almost surely, 2^661862204 is an apocalyptic number.

It is an amenable number.

661862204 is a deficient number, since it is larger than the sum of its proper divisors (498901540).

661862204 is a wasteful number, since it uses less digits than its factorization.

661862204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357844 (or 357842 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 661862204 is about 25726.6827243623. The cubic root of 661862204 is about 871.4768609065.

The spelling of 661862204 in words is "six hundred sixty-one million, eight hundred sixty-two thousand, two hundred four".