51440939894 has 8 divisors (see below), whose sum is σ = 77165861880. Its totient is φ = 25718985936.

The previous prime is 51440939873. The next prime is 51440939899. The reversal of 51440939894 is 49893904415.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51440939899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 698159 + ... + 768314.

It is an arithmetic number, because the mean of its divisors is an integer number (9645732735).

Almost surely, 2^51440939894 is an apocalyptic number.

51440939894 is a deficient number, since it is larger than the sum of its proper divisors (25724921986).

51440939894 is a wasteful number, since it uses less digits than its factorization.

51440939894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484014.

The product of its (nonzero) digits is 5598720, while the sum is 56.

The spelling of 51440939894 in words is "fifty-one billion, four hundred forty million, nine hundred thirty-nine thousand, eight hundred ninety-four".