666634064 has 10 divisors (see below), whose sum is σ = 1291603530. Its totient is φ = 333317024.

The previous prime is 666634061. The next prime is 666634079. The reversal of 666634064 is 460436666.

It can be written as a sum of positive squares in only one way, i.e., 576384064 + 90250000 = 24008^2 + 9500^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666634061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20832299 + ... + 20832330.

It is an arithmetic number, because the mean of its divisors is an integer number (129160353).

Almost surely, 2^666634064 is an apocalyptic number.

It is an amenable number.

666634064 is a deficient number, since it is larger than the sum of its proper divisors (624969466).

666634064 is a wasteful number, since it uses less digits than its factorization.

666634064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41664637 (or 41664631 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 41.

The square root of 666634064 is about 25819.2576190719. The cubic root of 666634064 is about 873.5662239778.

The spelling of 666634064 in words is "six hundred sixty-six million, six hundred thirty-four thousand, sixty-four".