66907649 has 8 divisors (see below), whose sum is σ = 68836608. Its totient is φ = 64999840.

The previous prime is 66907627. The next prime is 66907651. The reversal of 66907649 is 94670966.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66907649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66907609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1244 + ... + 11634.

It is an arithmetic number, because the mean of its divisors is an integer number (8604576).

Almost surely, 2^66907649 is an apocalyptic number.

It is an amenable number.

66907649 is a deficient number, since it is larger than the sum of its proper divisors (1928959).

66907649 is a wasteful number, since it uses less digits than its factorization.

66907649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10575.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 66907649 is about 8179.7095914219. The cubic root of 66907649 is about 405.9681132795.

The spelling of 66907649 in words is "sixty-six million, nine hundred seven thousand, six hundred forty-nine".