15645565253 has 2 divisors, whose sum is σ = 15645565254. Its totient is φ = 15645565252.

The previous prime is 15645565231. The next prime is 15645565267. The reversal of 15645565253 is 35256554651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15510958849 + 134606404 = 124543^2 + 11602^2 .

It is an emirp because it is prime and its reverse (35256554651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15645565253 - 2¹⁴ = 15645548869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15645565198 and 15645565207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15645565213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7822782626 + 7822782627.

It is an arithmetic number, because the mean of its divisors is an integer number (7822782627).

Almost surely, 2^15645565253 is an apocalyptic number.

It is an amenable number.

15645565253 is a deficient number, since it is larger than the sum of its proper divisors (1).

15645565253 is an equidigital number, since it uses as much as digits as its factorization.

15645565253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700000, while the sum is 47.

The spelling of 15645565253 in words is "fifteen billion, six hundred forty-five million, five hundred sixty-five thousand, two hundred fifty-three".