51066661500 has 72 divisors (see below), whose sum is σ = 161098309008. Its totient is φ = 13617775200.

The previous prime is 51066661453. The next prime is 51066661507. The reversal of 51066661500 is 516666015.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51066661507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5669574 + ... + 5678573.

It is an arithmetic number, because the mean of its divisors is an integer number (2237476514).

Almost surely, 2^51066661500 is an apocalyptic number.

51066661500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51066661500 is an abundant number, since it is smaller than the sum of its proper divisors (110031647508).

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

51066661500 is a wasteful number, since it uses less digits than its factorization.

51066661500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11348172 (or 11348157 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 51066661500 in words is "fifty-one billion, sixty-six million, six hundred sixty-one thousand, five hundred".