1618842473 has 4 divisors (see below), whose sum is σ = 1620900240. Its totient is φ = 1616784708.

The previous prime is 1618842469. The next prime is 1618842481. The reversal of 1618842473 is 3742488161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3742488161 = 509 ⋅7352629.

It is a cyclic number.

It is not a de Polignac number, because 1618842473 - 2² = 1618842469 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1618842773) 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, 1027703 + ... + 1029276.

It is an arithmetic number, because the mean of its divisors is an integer number (405225060).

Almost surely, 2^1618842473 is an apocalyptic number.

It is an amenable number.

1618842473 is a deficient number, since it is larger than the sum of its proper divisors (2057767).

1618842473 is an equidigital number, since it uses as much as digits as its factorization.

1618842473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2057766.

The product of its digits is 258048, while the sum is 44.

The square root of 1618842473 is about 40234.8415306933. The cubic root of 1618842473 is about 1174.1804994663.

The spelling of 1618842473 in words is "one billion, six hundred eighteen million, eight hundred forty-two thousand, four hundred seventy-three".