64677661 has 8 divisors (see below), whose sum is σ = 65233080. Its totient is φ = 64124928.

The previous prime is 64677659. The next prime is 64677689. The reversal of 64677661 is 16677646.

It can be written as a sum of positive squares in 4 ways, for example, as 38514436 + 26163225 = 6206^2 + 5115^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64677661 - 2¹ = 64677659 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 (64677611) 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 7 ways as a sum of consecutive naturals, for example, 111805 + ... + 112381.

It is an arithmetic number, because the mean of its divisors is an integer number (8154135).

Almost surely, 2^64677661 is an apocalyptic number.

It is an amenable number.

64677661 is a deficient number, since it is larger than the sum of its proper divisors (555419).

64677661 is a wasteful number, since it uses less digits than its factorization.

64677661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343.

The product of its digits is 254016, while the sum is 43.

The square root of 64677661 is about 8042.2422868252. The cubic root of 64677661 is about 401.4068399525.

The spelling of 64677661 in words is "sixty-four million, six hundred seventy-seven thousand, six hundred sixty-one".