51445235240 has 96 divisors (see below), whose sum is σ = 141736975200. Its totient is φ = 16710019200.

The previous prime is 51445235203. The next prime is 51445235273. The reversal of 51445235240 is 4253254415.

It is a super-2 number, since 2×51445235240² (a number of 22 digits) contains 22 as substring.

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 51445235240.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 653486 + ... + 727965.

It is an arithmetic number, because the mean of its divisors is an integer number (1476426825).

Almost surely, 2^51445235240 is an apocalyptic number.

It is an amenable number.

51445235240 is an abundant number, since it is smaller than the sum of its proper divisors (90291739960).

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

51445235240 is a wasteful number, since it uses less digits than its factorization.

51445235240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381495 (or 1381484 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 35.

Adding to 51445235240 its reverse (4253254415), we get a palindrome (55698489655).

The spelling of 51445235240 in words is "fifty-one billion, four hundred forty-five million, two hundred thirty-five thousand, two hundred forty".