51566699520 has 1056 divisors, whose sum is σ = 219741290496. Its totient is φ = 11346739200.

The previous prime is 51566699507. The next prime is 51566699521. The reversal of 51566699520 is 2599666515.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (51566699521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 269982625 + ... + 269982815.

Almost surely, 2^51566699520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51566699520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109870645248).

51566699520 is an abundant number, since it is smaller than the sum of its proper divisors (168174590976).

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

51566699520 is a wasteful number, since it uses less digits than its factorization.

51566699520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 4374000, while the sum is 54.

The spelling of 51566699520 in words is "fifty-one billion, five hundred sixty-six million, six hundred ninety-nine thousand, five hundred twenty".