51661749882 has 16 divisors (see below), whose sum is σ = 103653610560. Its totient is φ = 17165564832.

The previous prime is 51661749877. The next prime is 51661749883. The reversal of 51661749882 is 28894716615.

It is not an unprimeable number, because it can be changed into a prime (51661749883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13752582 + ... + 13756337.

It is an arithmetic number, because the mean of its divisors is an integer number (6478350660).

Almost surely, 2^51661749882 is an apocalyptic number.

51661749882 is an abundant number, since it is smaller than the sum of its proper divisors (51991860678).

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

51661749882 is a wasteful number, since it uses less digits than its factorization.

51661749882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27509237.

The product of its digits is 5806080, while the sum is 57.

The spelling of 51661749882 in words is "fifty-one billion, six hundred sixty-one million, seven hundred forty-nine thousand, eight hundred eighty-two".