51261798391983 has 20 divisors (see below), whose sum is σ = 76685505430248. Its totient is φ = 34125781107600.

The previous prime is 51261798391927. The next prime is 51261798392009. The reversal of 51261798391983 is 38919389716215.

51261798391983 is a `hidden beast` number, since 5 + 1 + 2 + 61 + 7 + 98 + 391 + 98 + 3 = 666.

51261798391983 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51261798391983 - 2¹² = 51261798387887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51261798391913) 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 19 ways as a sum of consecutive naturals, for example, 451342441 + ... + 451456002.

Almost surely, 2^{51261798391983} is an apocalyptic number.

51261798391983 is a deficient number, since it is larger than the sum of its proper divisors (25423707038265).

51261798391983 is an equidigital number, since it uses as much as digits as its factorization.

51261798391983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902799156 (or 902799147 counting only the distinct ones).

The product of its digits is 176359680, while the sum is 72.

The spelling of 51261798391983 in words is "fifty-one trillion, two hundred sixty-one billion, seven hundred ninety-eight million, three hundred ninety-one thousand, nine hundred eighty-three".