64674661 has 4 divisors (see below), whose sum is σ = 64690912. Its totient is φ = 64658412.

The previous prime is 64674637. The next prime is 64674667. The reversal of 64674661 is 16647646.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16647646 = 2 ⋅8323823.

It is a cyclic number.

It is not a de Polignac number, because 64674661 - 2⁹ = 64674149 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 (64674667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2326 + ... + 11608.

It is an arithmetic number, because the mean of its divisors is an integer number (16172728).

Almost surely, 2^64674661 is an apocalyptic number.

It is an amenable number.

64674661 is a deficient number, since it is larger than the sum of its proper divisors (16251).

64674661 is an equidigital number, since it uses as much as digits as its factorization.

64674661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16250.

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

The square root of 64674661 is about 8042.0557695157. The cubic root of 64674661 is about 401.4006335894.

The spelling of 64674661 in words is "sixty-four million, six hundred seventy-four thousand, six hundred sixty-one".