66649436 has 24 divisors (see below), whose sum is σ = 136552416. Its totient is φ = 27866880.

The previous prime is 66649433. The next prime is 66649439. The reversal of 66649436 is 63494666.

It is an interprime number because it is at equal distance from previous prime (66649433) and next prime (66649439).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66649433) 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, 27881 + ... + 30176.

It is an arithmetic number, because the mean of its divisors is an integer number (5689684).

Almost surely, 2^66649436 is an apocalyptic number.

It is an amenable number.

66649436 is an abundant number, since it is smaller than the sum of its proper divisors (69902980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66649436 is a wasteful number, since it uses less digits than its factorization.

66649436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58109 (or 58107 counting only the distinct ones).

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

The square root of 66649436 is about 8163.9105825578. The cubic root of 66649436 is about 405.4451965631.

The spelling of 66649436 in words is "sixty-six million, six hundred forty-nine thousand, four hundred thirty-six".