661341204 has 72 divisors (see below), whose sum is σ = 1721752032. Its totient is φ = 213917760.

The previous prime is 661341127. The next prime is 661341211. The reversal of 661341204 is 402143166.

661341204 is a `hidden beast` number, since 6 + 613 + 41 + 2 + 0 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 251014 + ... + 253634.

Almost surely, 2^661341204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661341204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (860876016).

661341204 is an abundant number, since it is smaller than the sum of its proper divisors (1060410828).

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

661341204 is a wasteful number, since it uses less digits than its factorization.

661341204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2837 (or 2832 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 661341204 is about 25716.5550570056. Note that the first 3 decimals coincide. The cubic root of 661341204 is about 871.2481332198.

The spelling of 661341204 in words is "six hundred sixty-one million, three hundred forty-one thousand, two hundred four".