66544907 has 16 divisors (see below), whose sum is σ = 80297952. Its totient is φ = 54328320.

The previous prime is 66544883. The next prime is 66544931. The reversal of 66544907 is 70944566.

It is an interprime number because it is at equal distance from previous prime (66544883) and next prime (66544931).

It is a cyclic number.

It is not a de Polignac number, because 66544907 - 2⁶ = 66544843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66544967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 998 + ... + 11579.

It is an arithmetic number, because the mean of its divisors is an integer number (5018622).

Almost surely, 2^66544907 is an apocalyptic number.

66544907 is a deficient number, since it is larger than the sum of its proper divisors (13753045).

66544907 is a wasteful number, since it uses less digits than its factorization.

66544907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12638.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 66544907 is about 8157.5061752965. The cubic root of 66544907 is about 405.2331269711.

The spelling of 66544907 in words is "sixty-six million, five hundred forty-four thousand, nine hundred seven".