51681043411 has 4 divisors (see below), whose sum is σ = 51948821032. Its totient is φ = 51413265792.

The previous prime is 51681043397. The next prime is 51681043439. The reversal of 51681043411 is 11434018615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51681043411 - 2¹⁵ = 51681010643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51681046411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133888521 + ... + 133888906.

It is an arithmetic number, because the mean of its divisors is an integer number (12987205258).

Almost surely, 2^51681043411 is an apocalyptic number.

51681043411 is a deficient number, since it is larger than the sum of its proper divisors (267777621).

51681043411 is a wasteful number, since it uses less digits than its factorization.

51681043411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267777620.

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 51681043411 in words is "fifty-one billion, six hundred eighty-one million, forty-three thousand, four hundred eleven".