51426433781 has 4 divisors (see below), whose sum is σ = 51435559200. Its totient is φ = 51417308364.

The previous prime is 51426433753. The next prime is 51426433813. The reversal of 51426433781 is 18733462415.

It is a happy number.

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 51426433781 - 2⁶ = 51426433717 is a prime.

It is a super-2 number, since 2×51426433781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51426433181) 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, 4554251 + ... + 4565528.

It is an arithmetic number, because the mean of its divisors is an integer number (12858889800).

Almost surely, 2^51426433781 is an apocalyptic number.

It is an amenable number.

51426433781 is a deficient number, since it is larger than the sum of its proper divisors (9125419).

51426433781 is an equidigital number, since it uses as much as digits as its factorization.

51426433781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9125418.

The product of its digits is 483840, while the sum is 44.

The spelling of 51426433781 in words is "fifty-one billion, four hundred twenty-six million, four hundred thirty-three thousand, seven hundred eighty-one".