66466660 has 24 divisors (see below), whose sum is σ = 150317496. Its totient is φ = 24541440.

The previous prime is 66466643. The next prime is 66466661. The reversal of 66466660 is 6666466.

It can be written as a sum of positive squares in 4 ways, for example, as 304704 + 66161956 = 552^2 + 8134^2 .

It is not an unprimeable number, because it can be changed into a prime (66466661) 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, 127561 + ... + 128080.

It is an arithmetic number, because the mean of its divisors is an integer number (6263229).

Almost surely, 2^66466660 is an apocalyptic number.

It is an amenable number.

66466660 is an abundant number, since it is smaller than the sum of its proper divisors (83850836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66466660 is a wasteful number, since it uses less digits than its factorization.

66466660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255663 (or 255661 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 40.

The square root of 66466660 is about 8152.7087523105. The cubic root of 66466660 is about 405.0742332048.

The spelling of 66466660 in words is "sixty-six million, four hundred sixty-six thousand, six hundred sixty".