51686128861510 has 32 divisors (see below), whose sum is σ = 109299897679392. Its totient is φ = 17349190106880.

The previous prime is 51686128861397. The next prime is 51686128861513. The reversal of 51686128861510 is 1516882168615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51686128861513) 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, 18072071599 + ... + 18072074458.

It is an arithmetic number, because the mean of its divisors is an integer number (3415621802481).

Almost surely, 2^{51686128861510} is an apocalyptic number.

51686128861510 is an abundant number, since it is smaller than the sum of its proper divisors (57613768817882).

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

51686128861510 is a wasteful number, since it uses less digits than its factorization.

51686128861510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36144146088.

The product of its (nonzero) digits is 5529600, while the sum is 58.

The spelling of 51686128861510 in words is "fifty-one trillion, six hundred eighty-six billion, one hundred twenty-eight million, eight hundred sixty-one thousand, five hundred ten".