51243222166620 has 384 divisors, whose sum is σ = 166451469004800. Its totient is φ = 11648680243200.

The previous prime is 51243222166603. The next prime is 51243222166649. The reversal of 51243222166620 is 2666122234215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 576908452 + ... + 576997268.

It is an arithmetic number, because the mean of its divisors is an integer number (433467367200).

Almost surely, 2^{51243222166620} 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 51243222166620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83225734502400).

51243222166620 is an abundant number, since it is smaller than the sum of its proper divisors (115208246838180).

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

51243222166620 is a wasteful number, since it uses less digits than its factorization.

51243222166620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89329 (or 89327 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 51243222166620 in words is "fifty-one trillion, two hundred forty-three billion, two hundred twenty-two million, one hundred sixty-six thousand, six hundred twenty".