51128368894 has 4 divisors (see below), whose sum is σ = 76692553344. Its totient is φ = 25564184446.

The previous prime is 51128368891. The next prime is 51128368927. The reversal of 51128368894 is 49886382115.

It is a happy number.

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

It is a super-2 number, since 2×51128368894² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51128368891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12782092222 + ... + 12782092225.

It is an arithmetic number, because the mean of its divisors is an integer number (19173138336).

Almost surely, 2^51128368894 is an apocalyptic number.

51128368894 is a deficient number, since it is larger than the sum of its proper divisors (25564184450).

51128368894 is a wasteful number, since it uses less digits than its factorization.

51128368894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25564184449.

The product of its digits is 3317760, while the sum is 55.

The spelling of 51128368894 in words is "fifty-one billion, one hundred twenty-eight million, three hundred sixty-eight thousand, eight hundred ninety-four".