661241204 has 12 divisors (see below), whose sum is σ = 1246185444. Its totient is φ = 305188224.

The previous prime is 661241183. The next prime is 661241263. The reversal of 661241204 is 402142166.

It can be written as a sum of positive squares in 2 ways, for example, as 216031204 + 445210000 = 14698^2 + 21100^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6358037 + ... + 6358140.

It is an arithmetic number, because the mean of its divisors is an integer number (103848787).

Almost surely, 2^661241204 is an apocalyptic number.

It is an amenable number.

661241204 is a deficient number, since it is larger than the sum of its proper divisors (584944240).

661241204 is a wasteful number, since it uses less digits than its factorization.

661241204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12716194 (or 12716192 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 661241204 is about 25714.6107106446. The cubic root of 661241204 is about 871.2042178125.

The spelling of 661241204 in words is "six hundred sixty-one million, two hundred forty-one thousand, two hundred four".