666474540569 has 2 divisors, whose sum is σ = 666474540570. Its totient is φ = 666474540568.

The previous prime is 666474540541. The next prime is 666474540583. The reversal of 666474540569 is 965045474666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 582188838169 + 84285702400 = 763013^2 + 290320^2 .

It is a cyclic number.

It is not a de Polignac number, because 666474540569 - 2¹⁶ = 666474475033 is a prime.

It is a super-2 number, since 2×666474540569² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (666474540169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333237270284 + 333237270285.

It is an arithmetic number, because the mean of its divisors is an integer number (333237270285).

Almost surely, 2^666474540569 is an apocalyptic number.

It is an amenable number.

666474540569 is a deficient number, since it is larger than the sum of its proper divisors (1).

666474540569 is an equidigital number, since it uses as much as digits as its factorization.

666474540569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 130636800, while the sum is 62.

The spelling of 666474540569 in words is "six hundred sixty-six billion, four hundred seventy-four million, five hundred forty thousand, five hundred sixty-nine".