1566261253 has 2 divisors, whose sum is σ = 1566261254. Its totient is φ = 1566261252.

The previous prime is 1566261173. The next prime is 1566261299. The reversal of 1566261253 is 3521626651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1189008324 + 377252929 = 34482^2 + 19423^2 .

It is a cyclic number.

It is not a de Polignac number, because 1566261253 - 2⁹ = 1566260741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1566262253) 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 as a sum of consecutive naturals, namely, 783130626 + 783130627.

It is an arithmetic number, because the mean of its divisors is an integer number (783130627).

Almost surely, 2^1566261253 is an apocalyptic number.

It is an amenable number.

1566261253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1566261253 is an equidigital number, since it uses as much as digits as its factorization.

1566261253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 37.

The square root of 1566261253 is about 39576.0186602948. The cubic root of 1566261253 is about 1161.3275657454.

The spelling of 1566261253 in words is "one billion, five hundred sixty-six million, two hundred sixty-one thousand, two hundred fifty-three".