666040536 has 96 divisors (see below), whose sum is σ = 2152206000. Its totient is φ = 190294272.

The previous prime is 666040523. The next prime is 666040553. The reversal of 666040536 is 635040666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 666040536.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 20881 + ... + 42048.

Almost surely, 2^666040536 is an apocalyptic number.

It is an amenable number.

666040536 is an abundant number, since it is smaller than the sum of its proper divisors (1486165464).

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

666040536 is a wasteful number, since it uses less digits than its factorization.

666040536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62958 (or 62941 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 666040536 is about 25807.7611582253. The cubic root of 666040536 is about 873.3068913127.

The spelling of 666040536 in words is "six hundred sixty-six million, forty thousand, five hundred thirty-six".