51961491880 has 16 divisors (see below), whose sum is σ = 116913356820. Its totient is φ = 20784596736.

The previous prime is 51961491847. The next prime is 51961491941. The reversal of 51961491880 is 8819416915.

It can be written as a sum of positive squares in 2 ways, for example, as 51294096324 + 667395556 = 226482^2 + 25834^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649518609 + ... + 649518688.

Almost surely, 2^51961491880 is an apocalyptic number.

It is an amenable number.

51961491880 is an abundant number, since it is smaller than the sum of its proper divisors (64951864940).

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

51961491880 is a wasteful number, since it uses less digits than its factorization.

51961491880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299037308 (or 1299037304 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 52.

The spelling of 51961491880 in words is "fifty-one billion, nine hundred sixty-one million, four hundred ninety-one thousand, eight hundred eighty".