51638365204 has 12 divisors (see below), whose sum is σ = 92809494484. Its totient is φ = 25121366784.

The previous prime is 51638365201. The next prime is 51638365231. The reversal of 51638365204 is 40256383615.

It can be written as a sum of positive squares in 2 ways, for example, as 32959676304 + 18678688900 = 181548^2 + 136670^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51638365201) 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, 174453789 + ... + 174454084.

Almost surely, 2^51638365204 is an apocalyptic number.

It is an amenable number.

51638365204 is a deficient number, since it is larger than the sum of its proper divisors (41171129280).

51638365204 is a wasteful number, since it uses less digits than its factorization.

51638365204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348907914 (or 348907912 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 51638365204 in words is "fifty-one billion, six hundred thirty-eight million, three hundred sixty-five thousand, two hundred four".