64866671 has 4 divisors (see below), whose sum is σ = 65595600. Its totient is φ = 64137744.

The previous prime is 64866667. The next prime is 64866673. The reversal of 64866671 is 17666846.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64866671 - 2² = 64866667 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64866673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364331 + ... + 364508.

It is an arithmetic number, because the mean of its divisors is an integer number (16398900).

Almost surely, 2^64866671 is an apocalyptic number.

64866671 is a deficient number, since it is larger than the sum of its proper divisors (728929).

64866671 is an equidigital number, since it uses as much as digits as its factorization.

64866671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728928.

The product of its digits is 290304, while the sum is 44.

The square root of 64866671 is about 8053.9847901520. The cubic root of 64866671 is about 401.7974751917.

The spelling of 64866671 in words is "sixty-four million, eight hundred sixty-six thousand, six hundred seventy-one".