51698690548 has 12 divisors (see below), whose sum is σ = 95794632612. Its totient is φ = 24328795520.

The previous prime is 51698690521. The next prime is 51698690573. The reversal of 51698690548 is 84509689615.

It can be written as a sum of positive squares in 2 ways, for example, as 35419992804 + 16278697744 = 188202^2 + 127588^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380137363 + ... + 380137498.

It is an arithmetic number, because the mean of its divisors is an integer number (7982886051).

Almost surely, 2^51698690548 is an apocalyptic number.

It is an amenable number.

51698690548 is a deficient number, since it is larger than the sum of its proper divisors (44095942064).

51698690548 is a wasteful number, since it uses less digits than its factorization.

51698690548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760274882 (or 760274880 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 61.

The spelling of 51698690548 in words is "fifty-one billion, six hundred ninety-eight million, six hundred ninety thousand, five hundred forty-eight".