66637107 has 12 divisors (see below), whose sum is σ = 98784520. Its totient is φ = 44396460.

The previous prime is 66637063. The next prime is 66637147. The reversal of 66637107 is 70173666.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 66637107 - 2¹¹ = 66635059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66637147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41632 + ... + 43202.

Almost surely, 2^66637107 is an apocalyptic number.

66637107 is a deficient number, since it is larger than the sum of its proper divisors (32147413).

66637107 is an frugal number, since it uses more digits than its factorization.

66637107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3151 (or 1574 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 36.

The square root of 66637107 is about 8163.1554560721. The cubic root of 66637107 is about 405.4201948907.

It can be divided in two parts, 666 and 37107, that added together give a palindrome (37773).

The spelling of 66637107 in words is "sixty-six million, six hundred thirty-seven thousand, one hundred seven".