51985091660889 has 8 divisors (see below), whose sum is σ = 69320019985920. Its totient is φ = 34653445554896.

The previous prime is 51985091660881. The next prime is 51985091660891. The reversal of 51985091660889 is 98806619058915.

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 51985091660889 - 2³ = 51985091660881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51985091660889.

It is not an unprimeable number, because it can be changed into a prime (51985091660881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 820517802 + ... + 820581155.

It is an arithmetic number, because the mean of its divisors is an integer number (8665002498240).

Almost surely, 2^{51985091660889} is an apocalyptic number.

It is an amenable number.

51985091660889 is a deficient number, since it is larger than the sum of its proper divisors (17334928325031).

51985091660889 is a wasteful number, since it uses less digits than its factorization.

51985091660889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641109519.

The product of its (nonzero) digits is 335923200, while the sum is 75.

The spelling of 51985091660889 in words is "fifty-one trillion, nine hundred eighty-five billion, ninety-one million, six hundred sixty thousand, eight hundred eighty-nine".