18979204729 has 2 divisors, whose sum is σ = 18979204730. Its totient is φ = 18979204728.

The previous prime is 18979204721. The next prime is 18979204793. The reversal of 18979204729 is 92740297981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16964541504 + 2014663225 = 130248^2 + 44885^2 .

It is a cyclic number.

It is not a de Polignac number, because 18979204729 - 2³ = 18979204721 is a prime.

It is a super-3 number, since 3×18979204729³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (18979204721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9489602364 + 9489602365.

It is an arithmetic number, because the mean of its divisors is an integer number (9489602365).

Almost surely, 2^18979204729 is an apocalyptic number.

It is an amenable number.

18979204729 is a deficient number, since it is larger than the sum of its proper divisors (1).

18979204729 is an equidigital number, since it uses as much as digits as its factorization.

18979204729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4572288, while the sum is 58.

The spelling of 18979204729 in words is "eighteen billion, nine hundred seventy-nine million, two hundred four thousand, seven hundred twenty-nine".