51142321320240 has 80 divisors (see below), whose sum is σ = 158550362100576. Its totient is φ = 13637163878400.

The previous prime is 51142321320227. The next prime is 51142321320331. The reversal of 51142321320240 is 4202312324115.

It is a happy number.

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 (30).

It is a junction number, because it is equal to n+sod(n) for n = 51142321320198 and 51142321320207.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1994251 + ... + 10308330.

Almost surely, 2^{51142321320240} is an apocalyptic number.

It is an amenable number.

51142321320240 is an abundant number, since it is smaller than the sum of its proper divisors (107408040780336).

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

51142321320240 is a wasteful number, since it uses less digits than its factorization.

51142321320240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12319918 (or 12319912 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 51142321320240 its reverse (4202312324115), we get a palindrome (55344633644355).

The spelling of 51142321320240 in words is "fifty-one trillion, one hundred forty-two billion, three hundred twenty-one million, three hundred twenty thousand, two hundred forty".