51490685000 has 40 divisors (see below), whose sum is σ = 120642686670. Its totient is φ = 20596272000.

The previous prime is 51490684981. The next prime is 51490685021. The reversal of 51490685000 is 58609415.

It can be written as a sum of positive squares in 5 ways, for example, as 415588996 + 51075096004 = 20386^2 + 225998^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5144069 + ... + 5154068.

Almost surely, 2^51490685000 is an apocalyptic number.

51490685000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51490685000 is an abundant number, since it is smaller than the sum of its proper divisors (69152001670).

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

51490685000 is a wasteful number, since it uses less digits than its factorization.

51490685000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10298163 (or 10298144 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 38.

The spelling of 51490685000 in words is "fifty-one billion, four hundred ninety million, six hundred eighty-five thousand".