66536649 has 9 divisors (see below), whose sum is σ = 96143853. Its totient is φ = 44341452.

The previous prime is 66536647. The next prime is 66536669. The reversal of 66536649 is 94663566.

The square root of 66536649 is 8157.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 66536649 - 2¹ = 66536647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66536647) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 23112 + ... + 25830.

Almost surely, 2^66536649 is an apocalyptic number.

66536649 is the 8157-th square number.

66536649 is the 4079-th centered octagonal number.

It is an amenable number.

66536649 is a deficient number, since it is larger than the sum of its proper divisors (29607204).

66536649 is an frugal number, since it uses more digits than its factorization.

66536649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5444 (or 2722 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The cubic root of 66536649 is about 405.2163635865.

The spelling of 66536649 in words is "sixty-six million, five hundred thirty-six thousand, six hundred forty-nine".