66649463 has 4 divisors (see below), whose sum is σ = 66677088. Its totient is φ = 66621840.

The previous prime is 66649459. The next prime is 66649481. The reversal of 66649463 is 36494666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66649463 - 2² = 66649459 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 (66649403) 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, 9806 + ... + 15147.

It is an arithmetic number, because the mean of its divisors is an integer number (16669272).

Almost surely, 2^66649463 is an apocalyptic number.

66649463 is a deficient number, since it is larger than the sum of its proper divisors (27625).

66649463 is a wasteful number, since it uses less digits than its factorization.

66649463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27624.

The product of its digits is 559872, while the sum is 44.

The square root of 66649463 is about 8163.9122361770. The cubic root of 66649463 is about 405.4452513123.

The spelling of 66649463 in words is "sixty-six million, six hundred forty-nine thousand, four hundred sixty-three".