1618606645 has 8 divisors (see below), whose sum is σ = 1987498656. Its totient is φ = 1264771536.

The previous prime is 1618606643. The next prime is 1618606679. The reversal of 1618606645 is 5466068161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1618606645 - 2¹ = 1618606643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618606643) 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 7 ways as a sum of consecutive naturals, for example, 3763987 + ... + 3764416.

It is an arithmetic number, because the mean of its divisors is an integer number (248437332).

Almost surely, 2^1618606645 is an apocalyptic number.

It is an amenable number.

1618606645 is a deficient number, since it is larger than the sum of its proper divisors (368892011).

1618606645 is an equidigital number, since it uses as much as digits as its factorization.

1618606645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7528451.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 1618606645 is about 40231.9107798772. The cubic root of 1618606645 is about 1174.1234796943.

The spelling of 1618606645 in words is "one billion, six hundred eighteen million, six hundred six thousand, six hundred forty-five".