51866680320 has 2112 divisors, whose sum is σ = 250906521600. Its totient is φ = 10032906240.

The previous prime is 51866680291. The next prime is 51866680337. The reversal of 51866680320 is 2308666815.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1673118705 + ... + 1673118735.

Almost surely, 2^51866680320 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 51866680320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125453260800).

51866680320 is an abundant number, since it is smaller than the sum of its proper divisors (199039841280).

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

51866680320 is a wasteful number, since it uses less digits than its factorization.

51866680320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 51866680320 in words is "fifty-one billion, eight hundred sixty-six million, six hundred eighty thousand, three hundred twenty".