18777690147 has 4 divisors (see below), whose sum is σ = 25036920200. Its totient is φ = 12518460096.

The previous prime is 18777690131. The next prime is 18777690161. The reversal of 18777690147 is 74109677781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74109677781 = 3 ⋅24703225927.

It is not a de Polignac number, because 18777690147 - 2⁴ = 18777690131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18777690847) 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 3 ways as a sum of consecutive naturals, for example, 3129615022 + ... + 3129615027.

It is an arithmetic number, because the mean of its divisors is an integer number (6259230050).

Almost surely, 2^18777690147 is an apocalyptic number.

18777690147 is a deficient number, since it is larger than the sum of its proper divisors (6259230053).

18777690147 is an equidigital number, since it uses as much as digits as its factorization.

18777690147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6259230052.

The product of its (nonzero) digits is 4148928, while the sum is 57.

The spelling of 18777690147 in words is "eighteen billion, seven hundred seventy-seven million, six hundred ninety thousand, one hundred forty-seven".