660432291 has 8 divisors (see below), whose sum is σ = 880784400. Its totient is φ = 440184192.

The previous prime is 660432287. The next prime is 660432301. The reversal of 660432291 is 192234066.

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

It is not a de Polignac number, because 660432291 - 2² = 660432287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660432221) 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, 9730 + ... + 37623.

It is an arithmetic number, because the mean of its divisors is an integer number (110098050).

Almost surely, 2^660432291 is an apocalyptic number.

660432291 is a deficient number, since it is larger than the sum of its proper divisors (220352109).

660432291 is a wasteful number, since it uses less digits than its factorization.

660432291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52005.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 660432291 is about 25698.8772322839. The cubic root of 660432291 is about 870.8488175041.

The spelling of 660432291 in words is "six hundred sixty million, four hundred thirty-two thousand, two hundred ninety-one".