66906469 has 8 divisors (see below), whose sum is σ = 76888448. Its totient is φ = 57030480.

The previous prime is 66906461. The next prime is 66906481. The reversal of 66906469 is 96460966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66906469 - 2³ = 66906461 is a prime.

It is a super-2 number, since 2×66906469² = 8952951188095922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66906461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25137 + ... + 27670.

It is an arithmetic number, because the mean of its divisors is an integer number (9611056).

Almost surely, 2^66906469 is an apocalyptic number.

It is an amenable number.

66906469 is a deficient number, since it is larger than the sum of its proper divisors (9981979).

66906469 is a wasteful number, since it uses less digits than its factorization.

66906469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52995.

The product of its (nonzero) digits is 419904, while the sum is 46.

The square root of 66906469 is about 8179.6374614038. The cubic root of 66906469 is about 405.9657266805.

The spelling of 66906469 in words is "sixty-six million, nine hundred six thousand, four hundred sixty-nine".