18879947029 has 2 divisors, whose sum is σ = 18879947030. Its totient is φ = 18879947028.

The previous prime is 18879947027. The next prime is 18879947039. The reversal of 18879947029 is 92074997881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9893286225 + 8986660804 = 99465^2 + 94798^2 .

It is a cyclic number.

It is not a de Polignac number, because 18879947029 - 2¹ = 18879947027 is a prime.

Together with 18879947027, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18879947027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9439973514 + 9439973515.

It is an arithmetic number, because the mean of its divisors is an integer number (9439973515).

Almost surely, 2^18879947029 is an apocalyptic number.

It is an amenable number.

18879947029 is a deficient number, since it is larger than the sum of its proper divisors (1).

18879947029 is an equidigital number, since it uses as much as digits as its factorization.

18879947029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18289152, while the sum is 64.

The spelling of 18879947029 in words is "eighteen billion, eight hundred seventy-nine million, nine hundred forty-seven thousand, twenty-nine".