51612206500 has 48 divisors (see below), whose sum is σ = 115767615600. Its totient is φ = 20086905600.

The previous prime is 51612206489. The next prime is 51612206509. The reversal of 51612206500 is 560221615.

It can be written as a sum of positive squares in 8 ways, for example, as 19272658276 + 32339548224 = 138826^2 + 179832^2 .

It is not an unprimeable number, because it can be changed into a prime (51612206509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1376425 + ... + 1413424.

It is an arithmetic number, because the mean of its divisors is an integer number (2411825325).

Almost surely, 2^51612206500 is an apocalyptic number.

51612206500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51612206500 is an abundant number, since it is smaller than the sum of its proper divisors (64155409100).

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

51612206500 is a wasteful number, since it uses less digits than its factorization.

51612206500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2789905 (or 2789893 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 51612206500 in words is "fifty-one billion, six hundred twelve million, two hundred six thousand, five hundred".