666011842549 has 4 divisors (see below), whose sum is σ = 701065097440. Its totient is φ = 630958587660.

The previous prime is 666011842499. The next prime is 666011842567. The reversal of 666011842549 is 945248110666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 666011842549 - 2¹³ = 666011834357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666011842496 and 666011842505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666711842549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17526627417 + ... + 17526627454.

It is an arithmetic number, because the mean of its divisors is an integer number (175266274360).

Almost surely, 2^666011842549 is an apocalyptic number.

It is an amenable number.

666011842549 is a deficient number, since it is larger than the sum of its proper divisors (35053254891).

666011842549 is a wasteful number, since it uses less digits than its factorization.

666011842549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35053254890.

The product of its (nonzero) digits is 2488320, while the sum is 52.

The spelling of 666011842549 in words is "six hundred sixty-six billion, eleven million, eight hundred forty-two thousand, five hundred forty-nine".