1618160639 has 4 divisors (see below), whose sum is σ = 1619029224. Its totient is φ = 1617292056.

The previous prime is 1618160629. The next prime is 1618160641. The reversal of 1618160639 is 9360618161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1618160639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1618160596 and 1618160605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618160629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431492 + ... + 435225.

It is an arithmetic number, because the mean of its divisors is an integer number (404757306).

Almost surely, 2^1618160639 is an apocalyptic number.

1618160639 is a deficient number, since it is larger than the sum of its proper divisors (868585).

1618160639 is an equidigital number, since it uses as much as digits as its factorization.

1618160639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868584.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 1618160639 is about 40226.3674596651. The cubic root of 1618160639 is about 1174.0156268024.

The spelling of 1618160639 in words is "one billion, six hundred eighteen million, one hundred sixty thousand, six hundred thirty-nine".