666261142 has 4 divisors (see below), whose sum is σ = 999391716. Its totient is φ = 333130570.

The previous prime is 666261139. The next prime is 666261157. The reversal of 666261142 is 241162666.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 666261098 and 666261107.

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 as a sum of consecutive naturals, namely, 166565284 + ... + 166565287.

It is an arithmetic number, because the mean of its divisors is an integer number (249847929).

Almost surely, 2^666261142 is an apocalyptic number.

666261142 is a deficient number, since it is larger than the sum of its proper divisors (333130574).

666261142 is a wasteful number, since it uses less digits than its factorization.

666261142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333130573.

The product of its digits is 20736, while the sum is 34.

The square root of 666261142 is about 25812.0348287383. The cubic root of 666261142 is about 873.4032995956.

The spelling of 666261142 in words is "six hundred sixty-six million, two hundred sixty-one thousand, one hundred forty-two".