66906149 has 4 divisors (see below), whose sum is σ = 69815136. Its totient is φ = 63997164.

The previous prime is 66906143. The next prime is 66906157. The reversal of 66906149 is 94160966.

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 66906149 - 2²⁰ = 65857573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66906143) 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, 1454459 + ... + 1454504.

It is an arithmetic number, because the mean of its divisors is an integer number (17453784).

Almost surely, 2^66906149 is an apocalyptic number.

It is an amenable number.

66906149 is a deficient number, since it is larger than the sum of its proper divisors (2908987).

66906149 is a wasteful number, since it uses less digits than its factorization.

66906149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2908986.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 66906149 is about 8179.6179006113. The cubic root of 66906149 is about 405.9650794623.

The spelling of 66906149 in words is "sixty-six million, nine hundred six thousand, one hundred forty-nine".