1868616613 has 4 divisors (see below), whose sum is σ = 1870102080. Its totient is φ = 1867131148.

The previous prime is 1868616559. The next prime is 1868616637. The reversal of 1868616613 is 3166168681.

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 1868616613 - 2²¹ = 1866519461 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 (1868616713) 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, 740845 + ... + 743362.

It is an arithmetic number, because the mean of its divisors is an integer number (467525520).

Almost surely, 2^1868616613 is an apocalyptic number.

It is an amenable number.

1868616613 is a deficient number, since it is larger than the sum of its proper divisors (1485467).

1868616613 is a wasteful number, since it uses less digits than its factorization.

1868616613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485466.

The product of its digits is 248832, while the sum is 46.

The square root of 1868616613 is about 43227.4983430686. The cubic root of 1868616613 is about 1231.7050873645.

The spelling of 1868616613 in words is "one billion, eight hundred sixty-eight million, six hundred sixteen thousand, six hundred thirteen".