1566052553 has 4 divisors (see below), whose sum is σ = 1686518148. Its totient is φ = 1445586960.

The previous prime is 1566052547. The next prime is 1566052591. The reversal of 1566052553 is 3552506651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3552506651 = 8761 ⋅405491.

It can be written as a sum of positive squares in 2 ways, for example, as 555639184 + 1010413369 = 23572^2 + 31787^2 .

It is a cyclic number.

It is not a de Polignac number, because 1566052553 - 2⁶ = 1566052489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1566052153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60232778 + ... + 60232803.

It is an arithmetic number, because the mean of its divisors is an integer number (421629537).

Almost surely, 2^1566052553 is an apocalyptic number.

1566052553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1566052553 is a deficient number, since it is larger than the sum of its proper divisors (120465595).

1566052553 is a wasteful number, since it uses less digits than its factorization.

1566052553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120465594.

The product of its (nonzero) digits is 135000, while the sum is 38.

The square root of 1566052553 is about 39573.3818746895. The cubic root of 1566052553 is about 1161.2759822206.

The spelling of 1566052553 in words is "one billion, five hundred sixty-six million, fifty-two thousand, five hundred fifty-three".