51440939895 has 16 divisors (see below), whose sum is σ = 82343997792. Its totient is φ = 27422336640.

The previous prime is 51440939873. The next prime is 51440939899. The reversal of 51440939895 is 59893904415.

It is not a de Polignac number, because 51440939895 - 2¹⁵ = 51440907127 is a prime.

It is a super-2 number, since 2×51440939895² (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 (51440939899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 768772 + ... + 833001.

It is an arithmetic number, because the mean of its divisors is an integer number (5146499862).

Almost surely, 2^51440939895 is an apocalyptic number.

51440939895 is a deficient number, since it is larger than the sum of its proper divisors (30903057897).

51440939895 is a wasteful number, since it uses less digits than its factorization.

51440939895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603922.

The product of its (nonzero) digits is 6998400, while the sum is 57.

The spelling of 51440939895 in words is "fifty-one billion, four hundred forty million, nine hundred thirty-nine thousand, eight hundred ninety-five".