64551440173 has 4 divisors (see below), whose sum is σ = 70419752928. Its totient is φ = 58683127420.

The previous prime is 64551440167. The next prime is 64551440201. The reversal of 64551440173 is 37104415546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64551440173 - 2¹⁷ = 64551309101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64551440113) 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 3 ways as a sum of consecutive naturals, for example, 2934156361 + ... + 2934156382.

It is an arithmetic number, because the mean of its divisors is an integer number (17604938232).

Almost surely, 2^64551440173 is an apocalyptic number.

It is an amenable number.

64551440173 is a deficient number, since it is larger than the sum of its proper divisors (5868312755).

64551440173 is a wasteful number, since it uses less digits than its factorization.

64551440173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5868312754.

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 64551440173 in words is "sixty-four billion, five hundred fifty-one million, four hundred forty thousand, one hundred seventy-three".