666563475 has 12 divisors (see below), whose sum is σ = 1102051736. Its totient is φ = 355500480.

The previous prime is 666563441. The next prime is 666563477. The reversal of 666563475 is 574365666.

It is not a de Polignac number, because 666563475 - 2¹² = 666559379 is a prime.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666563477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4443682 + ... + 4443831.

Almost surely, 2^666563475 is an apocalyptic number.

666563475 is a deficient number, since it is larger than the sum of its proper divisors (435488261).

666563475 is a wasteful number, since it uses less digits than its factorization.

666563475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8887526 (or 8887521 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 48.

The square root of 666563475 is about 25817.8905993499. The cubic root of 666563475 is about 873.5353892985.

The spelling of 666563475 in words is "six hundred sixty-six million, five hundred sixty-three thousand, four hundred seventy-five".