20629198666187 has 2 divisors, whose sum is σ = 20629198666188. Its totient is φ = 20629198666186.

The previous prime is 20629198666129. The next prime is 20629198666231. The reversal of 20629198666187 is 78166689192602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20629198666187 - 2³² = 20624903698891 is a prime.

It is a super-2 number, since 2×20629198666187² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20629198666187.

It is not a weakly prime, because it can be changed into another prime (20629198666117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10314599333093 + 10314599333094.

It is an arithmetic number, because the mean of its divisors is an integer number (10314599333094).

Almost surely, 2^{20629198666187} is an apocalyptic number.

20629198666187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20629198666187 is an equidigital number, since it uses as much as digits as its factorization.

20629198666187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 188116992, while the sum is 71.

The spelling of 20629198666187 in words is "twenty trillion, six hundred twenty-nine billion, one hundred ninety-eight million, six hundred sixty-six thousand, one hundred eighty-seven".