51756415620 has 576 divisors, whose sum is σ = 191252275200. Its totient is φ = 10429106688.

The previous prime is 51756415547. The next prime is 51756415657. The reversal of 51756415620 is 2651465715.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 79994137 + ... + 79994783.

It is an arithmetic number, because the mean of its divisors is an integer number (332035200).

Almost surely, 2^51756415620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51756415620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95626137600).

51756415620 is an abundant number, since it is smaller than the sum of its proper divisors (139495859580).

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

51756415620 is a wasteful number, since it uses less digits than its factorization.

51756415620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729 (or 700 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 51756415620 in words is "fifty-one billion, seven hundred fifty-six million, four hundred fifteen thousand, six hundred twenty".