51621555833016 has 128 divisors (see below), whose sum is σ = 141285840460800. Its totient is φ = 15620255239680.

The previous prime is 51621555832967. The next prime is 51621555833017. The reversal of 51621555833016 is 61033855512615.

It is a self number, because there is not a number n which added to its sum of digits gives 51621555833016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51621555833017) 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, 102884145 + ... + 103384671.

It is an arithmetic number, because the mean of its divisors is an integer number (1103795628600).

Almost surely, 2^{51621555833016} 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 51621555833016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70642920230400).

51621555833016 is an abundant number, since it is smaller than the sum of its proper divisors (89664284627784).

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

51621555833016 is a wasteful number, since it uses less digits than its factorization.

51621555833016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506029 (or 506025 counting only the distinct ones).

The product of its (nonzero) digits is 3240000, while the sum is 51.

The spelling of 51621555833016 in words is "fifty-one trillion, six hundred twenty-one billion, five hundred fifty-five million, eight hundred thirty-three thousand, sixteen".