64666747 has 8 divisors (see below), whose sum is σ = 68226560. Its totient is φ = 61122600.

The previous prime is 64666741. The next prime is 64666753. The reversal of 64666747 is 74766646.

It is an interprime number because it is at equal distance from previous prime (64666741) and next prime (64666753).

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 64666747 - 2⁷ = 64666619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64666697 and 64666706.

It is not an unprimeable number, because it can be changed into a prime (64666741) 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, 5122 + ... + 12472.

It is an arithmetic number, because the mean of its divisors is an integer number (8528320).

Almost surely, 2^64666747 is an apocalyptic number.

64666747 is a deficient number, since it is larger than the sum of its proper divisors (3559813).

64666747 is a wasteful number, since it uses less digits than its factorization.

64666747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7833.

The product of its digits is 1016064, while the sum is 46.

The square root of 64666747 is about 8041.5637160940. The cubic root of 64666747 is about 401.3842602827.

The spelling of 64666747 in words is "sixty-four million, six hundred sixty-six thousand, seven hundred forty-seven".