51897523841 has 4 divisors (see below), whose sum is σ = 51904165632. Its totient is φ = 51890882052.

The previous prime is 51897523813. The next prime is 51897523877. The reversal of 51897523841 is 14832579815.

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 a de Polignac number, because none of the positive numbers 2^k-51897523841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51897423841) 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, 3309161 + ... + 3324806.

It is an arithmetic number, because the mean of its divisors is an integer number (12976041408).

Almost surely, 2^51897523841 is an apocalyptic number.

It is an amenable number.

51897523841 is a deficient number, since it is larger than the sum of its proper divisors (6641791).

51897523841 is an equidigital number, since it uses as much as digits as its factorization.

51897523841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6641790.

The product of its digits is 2419200, while the sum is 53.

The spelling of 51897523841 in words is "fifty-one billion, eight hundred ninety-seven million, five hundred twenty-three thousand, eight hundred forty-one".