15556665253 has 2 divisors, whose sum is σ = 15556665254. Its totient is φ = 15556665252.

The previous prime is 15556665149. The next prime is 15556665347. The reversal of 15556665253 is 35256665551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15505728484 + 50936769 = 124522^2 + 7137^2 .

It is a cyclic number.

It is not a de Polignac number, because 15556665253 - 2¹⁷ = 15556534181 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15556665197 and 15556665206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15556665653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7778332626 + 7778332627.

It is an arithmetic number, because the mean of its divisors is an integer number (7778332627).

Almost surely, 2^15556665253 is an apocalyptic number.

It is an amenable number.

15556665253 is a deficient number, since it is larger than the sum of its proper divisors (1).

15556665253 is an equidigital number, since it uses as much as digits as its factorization.

15556665253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4050000, while the sum is 49.

The spelling of 15556665253 in words is "fifteen billion, five hundred fifty-six million, six hundred sixty-five thousand, two hundred fifty-three".