51046912881 has 20 divisors (see below), whose sum is σ = 76373935792. Its totient is φ = 33978314808.

The previous prime is 51046912871. The next prime is 51046912927. The reversal of 51046912881 is 18821964015.

It is a happy number.

51046912881 is a `hidden beast` number, since 510 + 4 + 6 + 9 + 128 + 8 + 1 = 666.

It is not a de Polignac number, because 51046912881 - 2¹⁵ = 51046880113 is a prime.

It is a super-2 number, since 2×51046912881² (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 (51046912871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 437971 + ... + 542136.

Almost surely, 2^51046912881 is an apocalyptic number.

It is an amenable number.

51046912881 is a deficient number, since it is larger than the sum of its proper divisors (25327022911).

51046912881 is an equidigital number, since it uses as much as digits as its factorization.

51046912881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980762 (or 980753 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The spelling of 51046912881 in words is "fifty-one billion, forty-six million, nine hundred twelve thousand, eight hundred eighty-one".