51661202460 has 48 divisors (see below), whose sum is σ = 165315849216. Its totient is φ = 11808274752.

The previous prime is 51661202347. The next prime is 51661202491. The reversal of 51661202460 is 6420216615.

It is a super-2 number, since 2×51661202460² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61501012 + ... + 61501851.

It is an arithmetic number, because the mean of its divisors is an integer number (3444080192).

Almost surely, 2^51661202460 is an apocalyptic number.

It is an amenable number.

51661202460 is an abundant number, since it is smaller than the sum of its proper divisors (113654646756).

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

51661202460 is a wasteful number, since it uses less digits than its factorization.

51661202460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123002882 (or 123002880 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 51661202460 in words is "fifty-one billion, six hundred sixty-one million, two hundred two thousand, four hundred sixty".