51775726987 has 4 divisors (see below), whose sum is σ = 51840691056. Its totient is φ = 51710762920.

The previous prime is 51775726913. The next prime is 51775727021. The reversal of 51775726987 is 78962757715.

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 51775726987 - 2¹¹ = 51775724939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51775726087) 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, 32480839 + ... + 32482432.

It is an arithmetic number, because the mean of its divisors is an integer number (12960172764).

Almost surely, 2^51775726987 is an apocalyptic number.

51775726987 is a deficient number, since it is larger than the sum of its proper divisors (64964069).

51775726987 is an equidigital number, since it uses as much as digits as its factorization.

51775726987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64964068.

The product of its digits is 51861600, while the sum is 64.

The spelling of 51775726987 in words is "fifty-one billion, seven hundred seventy-five million, seven hundred twenty-six thousand, nine hundred eighty-seven".