1564444453 has 12 divisors (see below), whose sum is σ = 1851874444. Its totient is φ = 1312819200.

The previous prime is 1564444451. The next prime is 1564444457. The reversal of 1564444453 is 3544444651.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 845239329 + 719205124 = 29073^2 + 26818^2 .

It is not a de Polignac number, because 1564444453 - 2¹ = 1564444451 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1564444451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 495708 + ... + 498853.

Almost surely, 2^1564444453 is an apocalyptic number.

1564444453 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1564444453 is a deficient number, since it is larger than the sum of its proper divisors (287429991).

1564444453 is a wasteful number, since it uses less digits than its factorization.

1564444453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994596 (or 994585 counting only the distinct ones).

The product of its digits is 460800, while the sum is 40.

The square root of 1564444453 is about 39553.0587059964. The cubic root of 1564444453 is about 1160.8783609393.

The spelling of 1564444453 in words is "one billion, five hundred sixty-four million, four hundred forty-four thousand, four hundred fifty-three".