51540983802 has 448 divisors, whose sum is σ = 154672266240. Its totient is φ = 12471148800.

The previous prime is 51540983801. The next prime is 51540983827. The reversal of 51540983802 is 20838904515.

51540983802 is a `hidden beast` number, since 515 + 40 + 98 + 3 + 8 + 0 + 2 = 666.

51540983802 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51540983802² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51540983801) by changing a digit.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 155712777 + ... + 155713107.

Almost surely, 2^51540983802 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51540983802, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77336133120).

51540983802 is an abundant number, since it is smaller than the sum of its proper divisors (103131282438).

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

51540983802 is a wasteful number, since it uses less digits than its factorization.

51540983802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461 (or 446 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 51540983802 in words is "fifty-one billion, five hundred forty million, nine hundred eighty-three thousand, eight hundred two".