666564061311 has 12 divisors (see below), whose sum is σ = 977185125592. Its totient is φ = 437743562256.

The previous prime is 666564061309. The next prime is 666564061313. The reversal of 666564061311 is 113160465666.

666564061311 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (666564061309) and next prime (666564061313).

It is not a de Polignac number, because 666564061311 - 2¹ = 666564061309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666564061313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 552705916 + ... + 552707121.

Almost surely, 2^666564061311 is an apocalyptic number.

666564061311 is a deficient number, since it is larger than the sum of its proper divisors (310621064281).

666564061311 is a wasteful number, since it uses less digits than its factorization.

666564061311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105413110 (or 1105413107 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 666564061311 in words is "six hundred sixty-six billion, five hundred sixty-four million, sixty-one thousand, three hundred eleven".