51251541040 has 80 divisors (see below), whose sum is σ = 139080241152. Its totient is φ = 17198076672.

The previous prime is 51251541023. The next prime is 51251541041. The reversal of 51251541040 is 4014515215.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (51251541041) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 947304 + ... + 999943.

Almost surely, 2^51251541040 is an apocalyptic number.

It is an amenable number.

51251541040 is an abundant number, since it is smaller than the sum of its proper divisors (87828700112).

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

51251541040 is a wasteful number, since it uses less digits than its factorization.

51251541040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947314 (or 1947308 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

The spelling of 51251541040 in words is "fifty-one billion, two hundred fifty-one million, five hundred forty-one thousand, forty".