51385835897 has 4 divisors (see below), whose sum is σ = 56057275536. Its totient is φ = 46714396260.

The previous prime is 51385835881. The next prime is 51385835909. The reversal of 51385835897 is 79853858315.

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 51385835897 - 2⁴ = 51385835881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51385835497) 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, 2335719803 + ... + 2335719824.

It is an arithmetic number, because the mean of its divisors is an integer number (14014318884).

Almost surely, 2^51385835897 is an apocalyptic number.

It is an amenable number.

51385835897 is a deficient number, since it is larger than the sum of its proper divisors (4671439639).

51385835897 is a wasteful number, since it uses less digits than its factorization.

51385835897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4671439638.

The product of its digits is 36288000, while the sum is 62.

The spelling of 51385835897 in words is "fifty-one billion, three hundred eighty-five million, eight hundred thirty-five thousand, eight hundred ninety-seven".