1663360253 has 4 divisors (see below), whose sum is σ = 1735680288. Its totient is φ = 1591040220.

The previous prime is 1663360243. The next prime is 1663360267. The reversal of 1663360253 is 3520633661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3520633661 = 359 ⋅9806779.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1663360253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663360243) 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, 36159983 + ... + 36160028.

It is an arithmetic number, because the mean of its divisors is an integer number (433920072).

Almost surely, 2^1663360253 is an apocalyptic number.

It is an amenable number.

1663360253 is a deficient number, since it is larger than the sum of its proper divisors (72320035).

1663360253 is an equidigital number, since it uses as much as digits as its factorization.

1663360253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72320034.

The product of its (nonzero) digits is 58320, while the sum is 35.

The square root of 1663360253 is about 40784.3138105816. The cubic root of 1663360253 is about 1184.8465450786.

The spelling of 1663360253 in words is "one billion, six hundred sixty-three million, three hundred sixty thousand, two hundred fifty-three".