51166901240 has 256 divisors, whose sum is σ = 156555141120. Its totient is φ = 14577868800.

The previous prime is 51166901237. The next prime is 51166901281. The reversal of 51166901240 is 4210966115.

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

It is a self number, because there is not a number n which added to its sum of digits gives 51166901240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1405265 + ... + 1441215.

It is an arithmetic number, because the mean of its divisors is an integer number (611543520).

Almost surely, 2^51166901240 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 51166901240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78277570560).

51166901240 is an abundant number, since it is smaller than the sum of its proper divisors (105388239880).

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

51166901240 is a wasteful number, since it uses less digits than its factorization.

51166901240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36022 (or 36018 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The spelling of 51166901240 in words is "fifty-one billion, one hundred sixty-six million, nine hundred one thousand, two hundred forty".