51551731700 has 72 divisors (see below), whose sum is σ = 128211085632. Its totient is φ = 17624724480.

The previous prime is 51551731691. The next prime is 51551731711. The reversal of 51551731700 is 713715515.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142787 + ... + 351413.

Almost surely, 2^51551731700 is an apocalyptic number.

51551731700 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51551731700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64105542816).

51551731700 is an abundant number, since it is smaller than the sum of its proper divisors (76659353932).

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

51551731700 is a wasteful number, since it uses less digits than its factorization.

51551731700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209001 (or 208994 counting only the distinct ones).

The product of its (nonzero) digits is 18375, while the sum is 35.

The spelling of 51551731700 in words is "fifty-one billion, five hundred fifty-one million, seven hundred thirty-one thousand, seven hundred".