2640443453 has 4 divisors (see below), whose sum is σ = 2658164700. Its totient is φ = 2622722208.

The previous prime is 2640443441. The next prime is 2640443459. The reversal of 2640443453 is 3543440462.

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 385808164 + 2254635289 = 19642^2 + 47483^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640443453 - 2⁶ = 2640443389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640443459) 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, 8860400 + ... + 8860697.

It is an arithmetic number, because the mean of its divisors is an integer number (664541175).

Almost surely, 2^2640443453 is an apocalyptic number.

It is an amenable number.

2640443453 is a deficient number, since it is larger than the sum of its proper divisors (17721247).

2640443453 is a wasteful number, since it uses less digits than its factorization.

2640443453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17721246.

The product of its (nonzero) digits is 138240, while the sum is 35.

The square root of 2640443453 is about 51385.2454796121. The cubic root of 2640443453 is about 1382.1620267180.

The spelling of 2640443453 in words is "two billion, six hundred forty million, four hundred forty-three thousand, four hundred fifty-three".