51662730737856 has 224 divisors, whose sum is σ = 159072840908800. Its totient is φ = 14491950796800.

The previous prime is 51662730737843. The next prime is 51662730737879. The reversal of 51662730737856 is 65873703726615.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (224).

It is a super-2 number, since 2×51662730737856² (a number of 28 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (66) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43770945 + ... + 44935743.

It is an arithmetic number, because the mean of its divisors is an integer number (710146611200).

Almost surely, 2^{51662730737856} is an apocalyptic number.

51662730737856 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51662730737856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79536420454400).

51662730737856 is an abundant number, since it is smaller than the sum of its proper divisors (107410110170944).

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

51662730737856 is a wasteful number, since it uses less digits than its factorization.

51662730737856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165423 (or 1165413 counting only the distinct ones).

The product of its (nonzero) digits is 266716800, while the sum is 66.

The spelling of 51662730737856 in words is "fifty-one trillion, six hundred sixty-two billion, seven hundred thirty million, seven hundred thirty-seven thousand, eight hundred fifty-six".