666601465 has 4 divisors (see below), whose sum is σ = 799921764. Its totient is φ = 533281168.

The previous prime is 666601459. The next prime is 666601487. The reversal of 666601465 is 564106666.

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

It can be written as a sum of positive squares in 2 ways, for example, as 277289104 + 389312361 = 16652^2 + 19731^2 .

It is a cyclic number.

It is not a de Polignac number, because 666601465 - 2¹⁷ = 666470393 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66660142 + ... + 66660151.

It is an arithmetic number, because the mean of its divisors is an integer number (199980441).

Almost surely, 2^666601465 is an apocalyptic number.

It is an amenable number.

666601465 is a deficient number, since it is larger than the sum of its proper divisors (133320299).

666601465 is a wasteful number, since it uses less digits than its factorization.

666601465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133320298.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 666601465 is about 25818.6263189969. The cubic root of 666601465 is about 873.5519843567.

The spelling of 666601465 in words is "six hundred sixty-six million, six hundred one thousand, four hundred sixty-five".