1618558326445 has 4 divisors (see below), whose sum is σ = 1942269991740. Its totient is φ = 1294846661152.

The previous prime is 1618558326443. The next prime is 1618558326449. The reversal of 1618558326445 is 5446238558161.

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

It can be written as a sum of positive squares in 2 ways, for example, as 360098406724 + 1258459919721 = 600082^2 + 1121811^2 .

It is a cyclic number.

It is not a de Polignac number, because 1618558326445 - 2¹ = 1618558326443 is a prime.

It is a super-2 number, since 2×1618558326445² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1618558326445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618558326443) 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, 161855832640 + ... + 161855832649.

It is an arithmetic number, because the mean of its divisors is an integer number (485567497935).

Almost surely, 2^{1618558326445} is an apocalyptic number.

It is an amenable number.

1618558326445 is a deficient number, since it is larger than the sum of its proper divisors (323711665295).

1618558326445 is an equidigital number, since it uses as much as digits as its factorization.

1618558326445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323711665294.

The product of its digits is 27648000, while the sum is 58.

The spelling of 1618558326445 in words is "one trillion, six hundred eighteen billion, five hundred fifty-eight million, three hundred twenty-six thousand, four hundred forty-five".