51661006200 has 120 divisors (see below), whose sum is σ = 179426384280. Its totient is φ = 13776264000.

The previous prime is 51661006193. The next prime is 51661006217. The reversal of 51661006200 is 260016615.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (27).

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 29 ways as a sum of consecutive naturals, for example, 1578276 + ... + 1610675.

It is an arithmetic number, because the mean of its divisors is an integer number (1495219869).

Almost surely, 2^51661006200 is an apocalyptic number.

51661006200 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51661006200 is an abundant number, since it is smaller than the sum of its proper divisors (127765378080).

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

51661006200 is a wasteful number, since it uses less digits than its factorization.

51661006200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3188979 (or 3188961 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The spelling of 51661006200 in words is "fifty-one billion, six hundred sixty-one million, six thousand, two hundred".