18824627977 has 4 divisors (see below), whose sum is σ = 18824976916. Its totient is φ = 18824279040.

The previous prime is 18824627917. The next prime is 18824628019. The reversal of 18824627977 is 77972642881.

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 244484496 + 18580143481 = 15636^2 + 136309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18824627977 is a prime.

It is a super-2 number, since 2×18824627977² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18824627917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74424 + ... + 207817.

It is an arithmetic number, because the mean of its divisors is an integer number (4706244229).

Almost surely, 2^18824627977 is an apocalyptic number.

It is an amenable number.

18824627977 is a deficient number, since it is larger than the sum of its proper divisors (348939).

18824627977 is an equidigital number, since it uses as much as digits as its factorization.

18824627977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348938.

The product of its digits is 18966528, while the sum is 61.

The spelling of 18824627977 in words is "eighteen billion, eight hundred twenty-four million, six hundred twenty-seven thousand, nine hundred seventy-seven".