51661204 has 24 divisors (see below), whose sum is σ = 104276480. Its totient is φ = 21936096.

The previous prime is 51661153. The next prime is 51661219. The reversal of 51661204 is 40216615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5412 + ... + 11515.

Almost surely, 2^51661204 is an apocalyptic number.

It is an amenable number.

51661204 is an abundant number, since it is smaller than the sum of its proper divisors (52615276).

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

51661204 is a wasteful number, since it uses less digits than its factorization.

51661204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17047 (or 17045 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 51661204 is about 7187.5728865870. The cubic root of 51661204 is about 372.4387335240.

Adding to 51661204 its reverse (40216615), we get a palindrome (91877819).

The spelling of 51661204 in words is "fifty-one million, six hundred sixty-one thousand, two hundred four".