20635631660233 has 2 divisors, whose sum is σ = 20635631660234. Its totient is φ = 20635631660232.

The previous prime is 20635631660219. The next prime is 20635631660239. The reversal of 20635631660233 is 33206613653602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20635105737744 + 525922489 = 4542588^2 + 22933^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20635631660233 is a prime.

It is a super-2 number, since 2×20635631660233² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20635631660239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10317815830116 + 10317815830117.

It is an arithmetic number, because the mean of its divisors is an integer number (10317815830117).

Almost surely, 2^{20635631660233} is an apocalyptic number.

It is an amenable number.

20635631660233 is a deficient number, since it is larger than the sum of its proper divisors (1).

20635631660233 is an equidigital number, since it uses as much as digits as its factorization.

20635631660233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 46.

The spelling of 20635631660233 in words is "twenty trillion, six hundred thirty-five billion, six hundred thirty-one million, six hundred sixty thousand, two hundred thirty-three".