1663892653 has 4 divisors (see below), whose sum is σ = 1695286908. Its totient is φ = 1632498400.

The previous prime is 1663892641. The next prime is 1663892677. The reversal of 1663892653 is 3562983661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 443228809 + 1220663844 = 21053^2 + 34938^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663892653 - 2¹³ = 1663884461 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1663892597 and 1663892606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663892623) 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, 15697048 + ... + 15697153.

It is an arithmetic number, because the mean of its divisors is an integer number (423821727).

Almost surely, 2^1663892653 is an apocalyptic number.

It is an amenable number.

1663892653 is a deficient number, since it is larger than the sum of its proper divisors (31394255).

1663892653 is an equidigital number, since it uses as much as digits as its factorization.

1663892653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31394254.

The product of its digits is 1399680, while the sum is 49.

The square root of 1663892653 is about 40790.8403075985. The cubic root of 1663892653 is about 1184.9729448386.

The spelling of 1663892653 in words is "one billion, six hundred sixty-three million, eight hundred ninety-two thousand, six hundred fifty-three".