66638106 has 16 divisors (see below), whose sum is σ = 148084800. Its totient is φ = 22212684.

The previous prime is 66638101. The next prime is 66638137. The reversal of 66638106 is 60183666.

It is not an unprimeable number, because it can be changed into a prime (66638101) 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, 616966 + ... + 617073.

It is an arithmetic number, because the mean of its divisors is an integer number (9255300).

Almost surely, 2^66638106 is an apocalyptic number.

66638106 is an abundant number, since it is smaller than the sum of its proper divisors (81446694).

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

66638106 is a wasteful number, since it uses less digits than its factorization.

66638106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234050 (or 1234044 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 66638106 is about 8163.2166454162. The cubic root of 66638106 is about 405.4222208528.

The spelling of 66638106 in words is "sixty-six million, six hundred thirty-eight thousand, one hundred six".