51562991616 has 416 divisors, whose sum is σ = 152989532160. Its totient is φ = 15383789568.

The previous prime is 51562991609. The next prime is 51562991651. The reversal of 51562991616 is 61619926515.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 406007745 + ... + 406007871.

Almost surely, 2^51562991616 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 51562991616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76494766080).

51562991616 is an abundant number, since it is smaller than the sum of its proper divisors (101426540544).

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

51562991616 is a wasteful number, since it uses less digits than its factorization.

51562991616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257 (or 235 counting only the distinct ones).

The product of its digits is 874800, while the sum is 51.

The spelling of 51562991616 in words is "fifty-one billion, five hundred sixty-two million, nine hundred ninety-one thousand, six hundred sixteen".