133542666 has 12 divisors (see below), whose sum is σ = 289342482. Its totient is φ = 44514216.

The previous prime is 133542641. The next prime is 133542691. The reversal of 133542666 is 666245331.

It is an interprime number because it is at equal distance from previous prime (133542641) and next prime (133542691).

It can be written as a sum of positive squares in only one way, i.e., 113103225 + 20439441 = 10635^2 + 4521^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 133542666.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3709501 + ... + 3709536.

Almost surely, 2^133542666 is an apocalyptic number.

133542666 is an abundant number, since it is smaller than the sum of its proper divisors (155799816).

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

133542666 is a wasteful number, since it uses less digits than its factorization.

133542666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7419045 (or 7419042 counting only the distinct ones).

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

The square root of 133542666 is about 11556.0661991873. The cubic root of 133542666 is about 511.1401711300.

Adding to 133542666 its reverse (666245331), we get a palindrome (799787997).

The spelling of 133542666 in words is "one hundred thirty-three million, five hundred forty-two thousand, six hundred sixty-six".