18145491677 has 4 divisors (see below), whose sum is σ = 18531566016. Its totient is φ = 17759417340.

The previous prime is 18145491653. The next prime is 18145491691. The reversal of 18145491677 is 77619454181.

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: 77619454181 = 1777 ⋅43680053.

It is a cyclic number.

It is not a de Polignac number, because 18145491677 - 2⁸ = 18145491421 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 (18145491607) 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, 193037099 + ... + 193037192.

It is an arithmetic number, because the mean of its divisors is an integer number (4632891504).

Almost surely, 2^18145491677 is an apocalyptic number.

It is an amenable number.

18145491677 is a deficient number, since it is larger than the sum of its proper divisors (386074339).

18145491677 is an equidigital number, since it uses as much as digits as its factorization.

18145491677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386074338.

The product of its digits is 1693440, while the sum is 53.

The spelling of 18145491677 in words is "eighteen billion, one hundred forty-five million, four hundred ninety-one thousand, six hundred seventy-seven".