660166251 has 8 divisors (see below), whose sum is σ = 896829840. Its totient is φ = 431806752.

The previous prime is 660166249. The next prime is 660166261. The reversal of 660166251 is 152661066.

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

It is not a de Polignac number, because 660166251 - 2¹ = 660166249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660166201) 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, 2075836 + ... + 2076153.

It is an arithmetic number, because the mean of its divisors is an integer number (112103730).

Almost surely, 2^660166251 is an apocalyptic number.

660166251 is a deficient number, since it is larger than the sum of its proper divisors (236663589).

660166251 is a wasteful number, since it uses less digits than its factorization.

660166251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4152045.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 660166251 is about 25693.7006092933. The cubic root of 660166251 is about 870.7318679754.

The spelling of 660166251 in words is "six hundred sixty million, one hundred sixty-six thousand, two hundred fifty-one".