51345521040 has 160 divisors (see below), whose sum is σ = 174046110336. Its totient is φ = 12418375680.

The previous prime is 51345521023. The next prime is 51345521047. The reversal of 51345521040 is 4012554315.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 51345520989 and 51345521007.

It is not an unprimeable number, because it can be changed into a prime (51345521047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1120662 + ... + 1165578.

Almost surely, 2^51345521040 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 51345521040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87023055168).

51345521040 is an abundant number, since it is smaller than the sum of its proper divisors (122700589296).

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

51345521040 is a wasteful number, since it uses less digits than its factorization.

51345521040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45377 (or 45371 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 51345521040 in words is "fifty-one billion, three hundred forty-five million, five hundred twenty-one thousand, forty".