51440561467644 has 12 divisors (see below), whose sum is σ = 120027976757864. Its totient is φ = 17146853822544.

The previous prime is 51440561467621. The next prime is 51440561467649. The reversal of 51440561467644 is 44676416504415.

51440561467644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×51440561467644² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51440561467649) 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, 2143356727807 + ... + 2143356727830.

Almost surely, 2^{51440561467644} is an apocalyptic number.

It is an amenable number.

51440561467644 is an abundant number, since it is smaller than the sum of its proper divisors (68587415290220).

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

51440561467644 is a wasteful number, since it uses less digits than its factorization.

51440561467644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4286713455644 (or 4286713455642 counting only the distinct ones).

The product of its (nonzero) digits is 38707200, while the sum is 57.

The spelling of 51440561467644 in words is "fifty-one trillion, four hundred forty billion, five hundred sixty-one million, four hundred sixty-seven thousand, six hundred forty-four".