666534497 has 4 divisors (see below), whose sum is σ = 701615280. Its totient is φ = 631453716.

The previous prime is 666534467. The next prime is 666534511. The reversal of 666534497 is 794435666.

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, and also an emirpimes, since its reverse is a distinct semiprime: 794435666 = 2 ⋅397217833.

It is a cyclic number.

It is not a de Polignac number, because 666534497 - 2¹⁴ = 666518113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666534467) 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, 17540363 + ... + 17540400.

It is an arithmetic number, because the mean of its divisors is an integer number (175403820).

Almost surely, 2^666534497 is an apocalyptic number.

It is an amenable number.

666534497 is a deficient number, since it is larger than the sum of its proper divisors (35080783).

666534497 is a wasteful number, since it uses less digits than its factorization.

666534497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35080782.

The product of its digits is 3265920, while the sum is 50.

The square root of 666534497 is about 25817.3293932583. The cubic root of 666534497 is about 873.5227305014.

The spelling of 666534497 in words is "six hundred sixty-six million, five hundred thirty-four thousand, four hundred ninety-seven".