18019194745 has 4 divisors (see below), whose sum is σ = 21623033700. Its totient is φ = 14415355792.

The previous prime is 18019194719. The next prime is 18019194793. The reversal of 18019194745 is 54749191081.

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 8246092864 + 9773101881 = 90808^2 + 98859^2 .

It is a cyclic number.

It is not a de Polignac number, because 18019194745 - 2¹⁹ = 18018670457 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1801919470 + ... + 1801919479.

It is an arithmetic number, because the mean of its divisors is an integer number (5405758425).

Almost surely, 2^18019194745 is an apocalyptic number.

It is an amenable number.

18019194745 is a deficient number, since it is larger than the sum of its proper divisors (3603838955).

18019194745 is an equidigital number, since it uses as much as digits as its factorization.

18019194745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3603838954.

The product of its (nonzero) digits is 362880, while the sum is 49.

The spelling of 18019194745 in words is "eighteen billion, nineteen million, one hundred ninety-four thousand, seven hundred forty-five".