11666400589 has 2 divisors, whose sum is σ = 11666400590. Its totient is φ = 11666400588.

The previous prime is 11666400547. The next prime is 11666400601. The reversal of 11666400589 is 98500466611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11423975689 + 242424900 = 106883^2 + 15570^2 .

It is an emirp because it is prime and its reverse (98500466611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11666400589 - 2⁷ = 11666400461 is a prime.

It is a super-2 number, since 2×11666400589² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11666400509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5833200294 + 5833200295.

It is an arithmetic number, because the mean of its divisors is an integer number (5833200295).

Almost surely, 2^11666400589 is an apocalyptic number.

It is an amenable number.

11666400589 is a deficient number, since it is larger than the sum of its proper divisors (1).

11666400589 is an equidigital number, since it uses as much as digits as its factorization.

11666400589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 11666400589 in words is "eleven billion, six hundred sixty-six million, four hundred thousand, five hundred eighty-nine".