51891722089 has 8 divisors (see below), whose sum is σ = 53591604480. Its totient is φ = 50193462000.

The previous prime is 51891722041. The next prime is 51891722101. The reversal of 51891722089 is 98022719815.

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 51891722089 - 2⁹ = 51891721577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51891722189) 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, 340387 + ... + 468664.

It is an arithmetic number, because the mean of its divisors is an integer number (6698950560).

Almost surely, 2^51891722089 is an apocalyptic number.

It is an amenable number.

51891722089 is a deficient number, since it is larger than the sum of its proper divisors (1699882391).

51891722089 is a wasteful number, since it uses less digits than its factorization.

51891722089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811151.

The product of its (nonzero) digits is 725760, while the sum is 52.

The spelling of 51891722089 in words is "fifty-one billion, eight hundred ninety-one million, seven hundred twenty-two thousand, eighty-nine".