666642153 has 8 divisors (see below), whose sum is σ = 889302400. Its totient is φ = 444205008.

The previous prime is 666642091. The next prime is 666642167. The reversal of 666642153 is 351246666.

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

It is not a de Polignac number, because 666642153 - 2⁶ = 666642089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666642553) 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, 48673 + ... + 60846.

It is an arithmetic number, because the mean of its divisors is an integer number (111162800).

Almost surely, 2^666642153 is an apocalyptic number.

It is an amenable number.

666642153 is a deficient number, since it is larger than the sum of its proper divisors (222660247).

666642153 is a wasteful number, since it uses less digits than its factorization.

666642153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111551.

The product of its digits is 155520, while the sum is 39.

The square root of 666642153 is about 25819.4142652385. The cubic root of 666642153 is about 873.5697572749.

The spelling of 666642153 in words is "six hundred sixty-six million, six hundred forty-two thousand, one hundred fifty-three".