666536369 has 2 divisors, whose sum is σ = 666536370. Its totient is φ = 666536368.

The previous prime is 666536347. The next prime is 666536399. The reversal of 666536369 is 963635666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 347449600 + 319086769 = 18640^2 + 17863^2 .

It is a cyclic number.

It is not a de Polignac number, because 666536369 - 2²⁰ = 665487793 is a prime.

It is a super-2 number, since 2×666536369² = 888541462399408322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (666536399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333268184 + 333268185.

It is an arithmetic number, because the mean of its divisors is an integer number (333268185).

Almost surely, 2^666536369 is an apocalyptic number.

It is an amenable number.

666536369 is a deficient number, since it is larger than the sum of its proper divisors (1).

666536369 is an equidigital number, since it uses as much as digits as its factorization.

666536369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3149280, while the sum is 50.

The square root of 666536369 is about 25817.3656479510. The cubic root of 666536369 is about 873.5235482800.

It can be divided in two parts, 6665 and 36369, that added together give a palindrome (43034).

The spelling of 666536369 in words is "six hundred sixty-six million, five hundred thirty-six thousand, three hundred sixty-nine".