51378674436881 has 4 divisors (see below), whose sum is σ = 56049463022064. Its totient is φ = 46707885851700.

The previous prime is 51378674436811. The next prime is 51378674436889. The reversal of 51378674436881 is 18863447687315.

51378674436881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51378674436881 - 2²⁶ = 51378607328017 is a prime.

It is a super-2 number, since 2×51378674436881² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51378674436889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2335394292575 + ... + 2335394292596.

It is an arithmetic number, because the mean of its divisors is an integer number (14012365755516).

Almost surely, 2^{51378674436881} is an apocalyptic number.

It is an amenable number.

51378674436881 is a deficient number, since it is larger than the sum of its proper divisors (4670788585183).

51378674436881 is a wasteful number, since it uses less digits than its factorization.

51378674436881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4670788585182.

The product of its digits is 650280960, while the sum is 71.

The spelling of 51378674436881 in words is "fifty-one trillion, three hundred seventy-eight billion, six hundred seventy-four million, four hundred thirty-six thousand, eight hundred eighty-one".