51897930871 has 8 divisors (see below), whose sum is σ = 57339913824. Its totient is φ = 46721410560.

The previous prime is 51897930863. The next prime is 51897930881. The reversal of 51897930871 is 17803979815.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51897930871 - 2³ = 51897930863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51897930881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66365250 + ... + 66366031.

It is an arithmetic number, because the mean of its divisors is an integer number (7167489228).

Almost surely, 2^51897930871 is an apocalyptic number.

51897930871 is a deficient number, since it is larger than the sum of its proper divisors (5441982953).

51897930871 is a wasteful number, since it uses less digits than its factorization.

51897930871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132731321.

The product of its (nonzero) digits is 3810240, while the sum is 58.

The spelling of 51897930871 in words is "fifty-one billion, eight hundred ninety-seven million, nine hundred thirty thousand, eight hundred seventy-one".