64147666 has 24 divisors (see below), whose sum is σ = 106580880. Its totient is φ = 28933080.

The previous prime is 64147663. The next prime is 64147697. The reversal of 64147666 is 66674146.

It is a happy number.

64147666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64147666² = 8229846106495112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64147663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32685 + ... + 34591.

It is an arithmetic number, because the mean of its divisors is an integer number (4440870).

Almost surely, 2^64147666 is an apocalyptic number.

64147666 is a deficient number, since it is larger than the sum of its proper divisors (42433214).

64147666 is a wasteful number, since it uses less digits than its factorization.

64147666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2070 (or 2059 counting only the distinct ones).

The product of its digits is 145152, while the sum is 40.

The square root of 64147666 is about 8009.2238075859. The cubic root of 64147666 is about 400.3074012007.

The spelling of 64147666 in words is "sixty-four million, one hundred forty-seven thousand, six hundred sixty-six".