51521550100 has 18 divisors (see below), whose sum is σ = 111801763934. Its totient is φ = 20608620000.

The previous prime is 51521550083. The next prime is 51521550103. The reversal of 51521550100 is 105512515.

It can be written as a sum of positive squares in 3 ways, for example, as 212051844 + 51309498256 = 14562^2 + 226516^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51521550103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 257607651 + ... + 257607850.

Almost surely, 2^51521550100 is an apocalyptic number.

51521550100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51521550100 is an abundant number, since it is smaller than the sum of its proper divisors (60280213834).

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

51521550100 is a wasteful number, since it uses less digits than its factorization.

51521550100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515215515 (or 515215508 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 25.

The spelling of 51521550100 in words is "fifty-one billion, five hundred twenty-one million, five hundred fifty thousand, one hundred".