6440356574173 has 4 divisors (see below), whose sum is σ = 6462337313628. Its totient is φ = 6418375834720.

The previous prime is 6440356574117. The next prime is 6440356574189. The reversal of 6440356574173 is 3714756530446.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6123660007609 + 316696566564 = 2474603^2 + 562758^2 .

It is a cyclic number.

It is not a de Polignac number, because 6440356574173 - 2²¹ = 6440354477021 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 (6440356514173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10990369288 + ... + 10990369873.

It is an arithmetic number, because the mean of its divisors is an integer number (1615584328407).

Almost surely, 2^{6440356574173} is an apocalyptic number.

It is an amenable number.

6440356574173 is a deficient number, since it is larger than the sum of its proper divisors (21980739455).

6440356574173 is a wasteful number, since it uses less digits than its factorization.

6440356574173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21980739454.

The product of its (nonzero) digits is 25401600, while the sum is 55.

The spelling of 6440356574173 in words is "six trillion, four hundred forty billion, three hundred fifty-six million, five hundred seventy-four thousand, one hundred seventy-three".