51444455309 has 24 divisors (see below), whose sum is σ = 58679843040. Its totient is φ = 44955787968.

The previous prime is 51444455287. The next prime is 51444455311. The reversal of 51444455309 is 90355444415.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-51444455309 is a prime.

It is a super-3 number, since 3×51444455309³ (a number of 33 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51444455309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51444455009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5251514 + ... + 5261300.

It is an arithmetic number, because the mean of its divisors is an integer number (2444993460).

Almost surely, 2^51444455309 is an apocalyptic number.

It is an amenable number.

51444455309 is a deficient number, since it is larger than the sum of its proper divisors (7235387731).

51444455309 is a wasteful number, since it uses less digits than its factorization.

51444455309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11469 (or 11456 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 51444455309 in words is "fifty-one billion, four hundred forty-four million, four hundred fifty-five thousand, three hundred nine".