51351719894 has 4 divisors (see below), whose sum is σ = 77027579844. Its totient is φ = 25675859946.

The previous prime is 51351719891. The next prime is 51351719897. The reversal of 51351719894 is 49891715315.

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

It is an interprime number because it is at equal distance from previous prime (51351719891) and next prime (51351719897).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51351719891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12837929972 + ... + 12837929975.

It is an arithmetic number, because the mean of its divisors is an integer number (19256894961).

Almost surely, 2^51351719894 is an apocalyptic number.

51351719894 is a deficient number, since it is larger than the sum of its proper divisors (25675859950).

51351719894 is a wasteful number, since it uses less digits than its factorization.

51351719894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25675859949.

The product of its digits is 1360800, while the sum is 53.

The spelling of 51351719894 in words is "fifty-one billion, three hundred fifty-one million, seven hundred nineteen thousand, eight hundred ninety-four".