51146625540 has 144 divisors (see below), whose sum is σ = 152261726400. Its totient is φ = 12792777984.

The previous prime is 51146625487. The next prime is 51146625589. The reversal of 51146625540 is 4552664115.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12092146 + ... + 12096374.

It is an arithmetic number, because the mean of its divisors is an integer number (1057373100).

Almost surely, 2^51146625540 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 51146625540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76130863200).

51146625540 is an abundant number, since it is smaller than the sum of its proper divisors (101115100860).

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

51146625540 is a wasteful number, since it uses less digits than its factorization.

51146625540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4466 (or 4361 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 51146625540 in words is "fifty-one billion, one hundred forty-six million, six hundred twenty-five thousand, five hundred forty".