661002166 has 8 divisors (see below), whose sum is σ = 1081639944. Its totient is φ = 300455520.

The previous prime is 661002137. The next prime is 661002169. The reversal of 661002166 is 661200166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661002169) 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 3 ways as a sum of consecutive naturals, for example, 15022755 + ... + 15022798.

It is an arithmetic number, because the mean of its divisors is an integer number (135204993).

Almost surely, 2^661002166 is an apocalyptic number.

661002166 is a deficient number, since it is larger than the sum of its proper divisors (420637778).

661002166 is a wasteful number, since it uses less digits than its factorization.

661002166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30045566.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 661002166 is about 25709.9623881483. The cubic root of 661002166 is about 871.0992253570.

The spelling of 661002166 in words is "six hundred sixty-one million, two thousand, one hundred sixty-six".