666146540 has 24 divisors (see below), whose sum is σ = 1431442320. Its totient is φ = 260261568.

The previous prime is 666146527. The next prime is 666146543. The reversal of 666146540 is 45641666.

It is a junction number, because it is equal to n+sod(n) for n = 666146494 and 666146503.

It is not an unprimeable number, because it can be changed into a prime (666146543) 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, 386435 + ... + 388154.

It is an arithmetic number, because the mean of its divisors is an integer number (59643430).

Almost surely, 2^666146540 is an apocalyptic number.

It is an amenable number.

666146540 is an abundant number, since it is smaller than the sum of its proper divisors (765295780).

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

666146540 is a wasteful number, since it uses less digits than its factorization.

666146540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774641 (or 774639 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 666146540 is about 25809.8147998005. The cubic root of 666146540 is about 873.3532193803.

The spelling of 666146540 in words is "six hundred sixty-six million, one hundred forty-six thousand, five hundred forty".