20329854372649 has 2 divisors, whose sum is σ = 20329854372650. Its totient is φ = 20329854372648.

The previous prime is 20329854372637. The next prime is 20329854372673. The reversal of 20329854372649 is 94627345892302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19714621213225 + 615233159424 = 4440115^2 + 784368^2 .

It is a cyclic number.

It is not a de Polignac number, because 20329854372649 - 2⁷ = 20329854372521 is a prime.

It is not a weakly prime, because it can be changed into another prime (20329854378649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10164927186324 + 10164927186325.

It is an arithmetic number, because the mean of its divisors is an integer number (10164927186325).

Almost surely, 2^{20329854372649} is an apocalyptic number.

It is an amenable number.

20329854372649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20329854372649 is an equidigital number, since it uses as much as digits as its factorization.

20329854372649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 156764160, while the sum is 64.

The spelling of 20329854372649 in words is "twenty trillion, three hundred twenty-nine billion, eight hundred fifty-four million, three hundred seventy-two thousand, six hundred forty-nine".