1613065673 has 4 divisors (see below), whose sum is σ = 1615680660. Its totient is φ = 1610450688.

The previous prime is 1613065661. The next prime is 1613065703. The reversal of 1613065673 is 3765603161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3765603161 = 3793 ⋅992777.

It can be written as a sum of positive squares in 2 ways, for example, as 96196864 + 1516868809 = 9808^2 + 38947^2 .

It is a cyclic number.

It is not a de Polignac number, because 1613065673 - 2¹⁸ = 1612803529 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1613065613) 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, 1306568 + ... + 1307801.

It is an arithmetic number, because the mean of its divisors is an integer number (403920165).

Almost surely, 2^1613065673 is an apocalyptic number.

It is an amenable number.

1613065673 is a deficient number, since it is larger than the sum of its proper divisors (2614987).

1613065673 is an equidigital number, since it uses as much as digits as its factorization.

1613065673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2614986.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 1613065673 is about 40162.9888454532. The cubic root of 1613065673 is about 1172.7821566407.

The spelling of 1613065673 in words is "one billion, six hundred thirteen million, sixty-five thousand, six hundred seventy-three".