20349669569 has 2 divisors, whose sum is σ = 20349669570. Its totient is φ = 20349669568.

The previous prime is 20349669563. The next prime is 20349669611. The reversal of 20349669569 is 96596694302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16914303025 + 3435366544 = 130055^2 + 58612^2 .

It is a cyclic number.

It is not a de Polignac number, because 20349669569 - 2²⁰ = 20348620993 is a prime.

It is a super-2 number, since 2×20349669569² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20349669563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10174834784 + 10174834785.

It is an arithmetic number, because the mean of its divisors is an integer number (10174834785).

Almost surely, 2^20349669569 is an apocalyptic number.

It is an amenable number.

20349669569 is a deficient number, since it is larger than the sum of its proper divisors (1).

20349669569 is an equidigital number, since it uses as much as digits as its factorization.

20349669569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18895680, while the sum is 59.

The spelling of 20349669569 in words is "twenty billion, three hundred forty-nine million, six hundred sixty-nine thousand, five hundred sixty-nine".