51621166747 has 16 divisors (see below), whose sum is σ = 54632016000. Its totient is φ = 48640296960.

The previous prime is 51621166741. The next prime is 51621166763. The reversal of 51621166747 is 74766112615.

It is a cyclic number.

It is not a de Polignac number, because 51621166747 - 2¹⁵ = 51621133979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51621166697 and 51621166706.

It is not an unprimeable number, because it can be changed into a prime (51621166741) 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, 3366504 + ... + 3381802.

It is an arithmetic number, because the mean of its divisors is an integer number (3414501000).

Almost surely, 2^51621166747 is an apocalyptic number.

51621166747 is a deficient number, since it is larger than the sum of its proper divisors (3010849253).

51621166747 is a wasteful number, since it uses less digits than its factorization.

51621166747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16266.

The product of its digits is 423360, while the sum is 46.

The spelling of 51621166747 in words is "fifty-one billion, six hundred twenty-one million, one hundred sixty-six thousand, seven hundred forty-seven".