51183439494 has 32 divisors (see below), whose sum is σ = 113245827840. Its totient is φ = 15291679200.

The previous prime is 51183439471. The next prime is 51183439499. The reversal of 51183439494 is 49493438115.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51183439499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5456629 + ... + 5466000.

It is an arithmetic number, because the mean of its divisors is an integer number (3538932120).

Almost surely, 2^51183439494 is an apocalyptic number.

51183439494 is an abundant number, since it is smaller than the sum of its proper divisors (62062388346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51183439494 is a wasteful number, since it uses less digits than its factorization.

51183439494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10922716.

The product of its digits is 1866240, while the sum is 51.

The spelling of 51183439494 in words is "fifty-one billion, one hundred eighty-three million, four hundred thirty-nine thousand, four hundred ninety-four".