66544371 has 6 divisors (see below), whose sum is σ = 96119660. Its totient is φ = 44362908.

The previous prime is 66544363. The next prime is 66544397. The reversal of 66544371 is 17344566.

It is a happy number.

It is not a de Polignac number, because 66544371 - 2³ = 66544363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66544301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3696901 + ... + 3696918.

Almost surely, 2^66544371 is an apocalyptic number.

66544371 is a deficient number, since it is larger than the sum of its proper divisors (29575289).

66544371 is a wasteful number, since it uses less digits than its factorization.

66544371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7393825 (or 7393822 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 66544371 is about 8157.4733220526. The cubic root of 66544371 is about 405.2320389562.

It can be divided in two parts, 6654 and 4371, that added together give a square (11025 = 105²).

The spelling of 66544371 in words is "sixty-six million, five hundred forty-four thousand, three hundred seventy-one".