51005651250 has 80 divisors (see below), whose sum is σ = 127636293312. Its totient is φ = 13584120000.

The previous prime is 51005651219. The next prime is 51005651309. The reversal of 51005651250 is 5215650015.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3070467 + ... + 3087033.

Almost surely, 2^51005651250 is an apocalyptic number.

51005651250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51005651250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63818146656).

51005651250 is an abundant number, since it is smaller than the sum of its proper divisors (76630642062).

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

51005651250 is a wasteful number, since it uses less digits than its factorization.

51005651250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17413 (or 17398 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

The spelling of 51005651250 in words is "fifty-one billion, five million, six hundred fifty-one thousand, two hundred fifty".