51621750552504 has 192 divisors, whose sum is σ = 150240315456000. Its totient is φ = 14718580208640.

The previous prime is 51621750552503. The next prime is 51621750552509. The reversal of 51621750552504 is 40525505712615.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51621750552503) 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, 174960897 + ... + 175255695.

It is an arithmetic number, because the mean of its divisors is an integer number (782501643000).

Almost surely, 2^{51621750552504} 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 51621750552504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75120157728000).

51621750552504 is an abundant number, since it is smaller than the sum of its proper divisors (98618564903496).

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

51621750552504 is a wasteful number, since it uses less digits than its factorization.

51621750552504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298394 (or 298379 counting only the distinct ones).

The product of its (nonzero) digits is 2100000, while the sum is 48.

The spelling of 51621750552504 in words is "fifty-one trillion, six hundred twenty-one billion, seven hundred fifty million, five hundred fifty-two thousand, five hundred four".