51849256440 has 32 divisors (see below), whose sum is σ = 155547769680. Its totient is φ = 13826468352.

The previous prime is 51849256411. The next prime is 51849256447. The reversal of 51849256440 is 4465294815.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 51849256440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51849256447) 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 7 ways as a sum of consecutive naturals, for example, 216038449 + ... + 216038688.

Almost surely, 2^51849256440 is an apocalyptic number.

It is an amenable number.

51849256440 is an abundant number, since it is smaller than the sum of its proper divisors (103698513240).

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

51849256440 is a wasteful number, since it uses less digits than its factorization.

51849256440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432077151 (or 432077147 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 48.

The spelling of 51849256440 in words is "fifty-one billion, eight hundred forty-nine million, two hundred fifty-six thousand, four hundred forty".