51245497257328 has 240 divisors, whose sum is σ = 115197507887616. Its totient is φ = 21887349120000.

The previous prime is 51245497257323. The next prime is 51245497257371. The reversal of 51245497257328 is 82375279454215.

It is a super-2 number, since 2×51245497257328² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51245497257328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51245497257323) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1463178025 + ... + 1463213047.

Almost surely, 2^{51245497257328} 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 51245497257328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57598753943808).

51245497257328 is an abundant number, since it is smaller than the sum of its proper divisors (63952010630288).

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

51245497257328 is a wasteful number, since it uses less digits than its factorization.

51245497257328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35356 (or 35319 counting only the distinct ones).

The product of its digits is 169344000, while the sum is 64.

The spelling of 51245497257328 in words is "fifty-one trillion, two hundred forty-five billion, four hundred ninety-seven million, two hundred fifty-seven thousand, three hundred twenty-eight".