19659965253 has 4 divisors (see below), whose sum is σ = 26213287008. Its totient is φ = 13106643500.

The previous prime is 19659965219. The next prime is 19659965257. The reversal of 19659965253 is 35256995691.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19659965253 - 2²⁵ = 19626410821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19659965257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3276660873 + ... + 3276660878.

It is an arithmetic number, because the mean of its divisors is an integer number (6553321752).

Almost surely, 2^19659965253 is an apocalyptic number.

It is an amenable number.

19659965253 is a deficient number, since it is larger than the sum of its proper divisors (6553321755).

19659965253 is an equidigital number, since it uses as much as digits as its factorization.

19659965253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6553321754.

The product of its digits is 19683000, while the sum is 60.

The spelling of 19659965253 in words is "nineteen billion, six hundred fifty-nine million, nine hundred sixty-five thousand, two hundred fifty-three".