51247736881 has 16 divisors (see below), whose sum is σ = 56708038656. Its totient is φ = 45921330000.

The previous prime is 51247736867. The next prime is 51247736887. The reversal of 51247736881 is 18863774215.

It is a cyclic number.

It is not a de Polignac number, because 51247736881 - 2²⁹ = 50710865969 is a prime.

It is a super-2 number, since 2×51247736881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51247736887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6252496 + ... + 6260686.

It is an arithmetic number, because the mean of its divisors is an integer number (3544252416).

Almost surely, 2^51247736881 is an apocalyptic number.

It is an amenable number.

51247736881 is a deficient number, since it is larger than the sum of its proper divisors (5460301775).

51247736881 is a wasteful number, since it uses less digits than its factorization.

51247736881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16284.

The product of its digits is 2257920, while the sum is 52.

The spelling of 51247736881 in words is "fifty-one billion, two hundred forty-seven million, seven hundred thirty-six thousand, eight hundred eighty-one".