1613643663 has 4 divisors (see below), whose sum is σ = 2151524888. Its totient is φ = 1075762440.

The previous prime is 1613643641. The next prime is 1613643719. The reversal of 1613643663 is 3663463161.

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

It is not a de Polignac number, because 1613643663 - 2⁵ = 1613643631 is a prime.

It is a super-2 number, since 2×1613643663² = 5207691742280115138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1613643623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268940608 + ... + 268940613.

It is an arithmetic number, because the mean of its divisors is an integer number (537881222).

Almost surely, 2^1613643663 is an apocalyptic number.

1613643663 is a deficient number, since it is larger than the sum of its proper divisors (537881225).

1613643663 is an equidigital number, since it uses as much as digits as its factorization.

1613643663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537881224.

The product of its digits is 139968, while the sum is 39.

The square root of 1613643663 is about 40170.1837561144. The cubic root of 1613643663 is about 1172.9222161195.

The spelling of 1613643663 in words is "one billion, six hundred thirteen million, six hundred forty-three thousand, six hundred sixty-three".