51558953939 has 4 divisors (see below), whose sum is σ = 51560226960. Its totient is φ = 51557680920.

The previous prime is 51558953911. The next prime is 51558953959. The reversal of 51558953939 is 93935985515.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51558953939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51558953959) 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, 573692 + ... + 657449.

It is an arithmetic number, because the mean of its divisors is an integer number (12890056740).

Almost surely, 2^51558953939 is an apocalyptic number.

51558953939 is a deficient number, since it is larger than the sum of its proper divisors (1273021).

51558953939 is a wasteful number, since it uses less digits than its factorization.

51558953939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273020.

The product of its digits is 32805000, while the sum is 62.

The spelling of 51558953939 in words is "fifty-one billion, five hundred fifty-eight million, nine hundred fifty-three thousand, nine hundred thirty-nine".