20366591669 has 2 divisors, whose sum is σ = 20366591670. Its totient is φ = 20366591668.

The previous prime is 20366591647. The next prime is 20366591677. The reversal of 20366591669 is 96619566302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16616499025 + 3750092644 = 128905^2 + 61238^2 .

It is a cyclic number.

It is not a de Polignac number, because 20366591669 - 2²⁸ = 20098156213 is a prime.

It is a super-2 number, since 2×20366591669² (a number of 21 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 20366591669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20366591629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10183295834 + 10183295835.

It is an arithmetic number, because the mean of its divisors is an integer number (10183295835).

Almost surely, 2^20366591669 is an apocalyptic number.

It is an amenable number.

20366591669 is a deficient number, since it is larger than the sum of its proper divisors (1).

20366591669 is an equidigital number, since it uses as much as digits as its factorization.

20366591669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3149280, while the sum is 53.

The spelling of 20366591669 in words is "twenty billion, three hundred sixty-six million, five hundred ninety-one thousand, six hundred sixty-nine".