51521457720404 has 96 divisors (see below), whose sum is σ = 108495402172416. Its totient is φ = 20929984225920.

The previous prime is 51521457720373. The next prime is 51521457720407. The reversal of 51521457720404 is 40402775412515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51521457720407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70218074 + ... + 70948014.

It is an arithmetic number, because the mean of its divisors is an integer number (1130160439296).

Almost surely, 2^{51521457720404} 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 51521457720404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54247701086208).

51521457720404 is an abundant number, since it is smaller than the sum of its proper divisors (56973944452012).

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

51521457720404 is a wasteful number, since it uses less digits than its factorization.

51521457720404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730965 (or 730963 counting only the distinct ones).

The product of its (nonzero) digits is 1568000, while the sum is 47.

The spelling of 51521457720404 in words is "fifty-one trillion, five hundred twenty-one billion, four hundred fifty-seven million, seven hundred twenty thousand, four hundred four".