51554156544 has 432 divisors, whose sum is σ = 169302435120. Its totient is φ = 14973665280.

The previous prime is 51554156519. The next prime is 51554156593. The reversal of 51554156544 is 44565145515.

51554156544 is a `hidden beast` number, since 5 + 1 + 5 + 5 + 41 + 565 + 44 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 51554156544.

It is a congruent number.

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, 376307644 + ... + 376307780.

It is an arithmetic number, because the mean of its divisors is an integer number (391903785).

Almost surely, 2^51554156544 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 51554156544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84651217560).

51554156544 is an abundant number, since it is smaller than the sum of its proper divisors (117748278576).

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

51554156544 is a wasteful number, since it uses less digits than its factorization.

51554156544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 182 counting only the distinct ones).

The product of its digits is 1200000, while the sum is 45.

The spelling of 51554156544 in words is "fifty-one billion, five hundred fifty-four million, one hundred fifty-six thousand, five hundred forty-four".