51504215004 has 72 divisors (see below), whose sum is σ = 142188948720. Its totient is φ = 15589516800.

The previous prime is 51504214981. The next prime is 51504215011. The reversal of 51504215004 is 40051240515.

51504215004 is a `hidden beast` number, since 5 + 1 + 504 + 2 + 150 + 0 + 4 = 666.

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, 275062 + ... + 422690.

It is an arithmetic number, because the mean of its divisors is an integer number (1974846510).

Almost surely, 2^51504215004 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 51504215004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71094474360).

51504215004 is an abundant number, since it is smaller than the sum of its proper divisors (90684733716).

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

51504215004 is a wasteful number, since it uses less digits than its factorization.

51504215004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148531 (or 148526 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

Adding to 51504215004 its reverse (40051240515), we get a palindrome (91555455519).

The spelling of 51504215004 in words is "fifty-one billion, five hundred four million, two hundred fifteen thousand, four".