660889311 has 8 divisors (see below), whose sum is σ = 895631664. Its totient is φ = 433369920.

The previous prime is 660889289. The next prime is 660889319. The reversal of 660889311 is 113988066.

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

It is not a de Polignac number, because 660889311 - 2⁷ = 660889183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660889319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1805526 + ... + 1805891.

It is an arithmetic number, because the mean of its divisors is an integer number (111953958).

Almost surely, 2^660889311 is an apocalyptic number.

660889311 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

660889311 is a deficient number, since it is larger than the sum of its proper divisors (234742353).

660889311 is a wasteful number, since it uses less digits than its factorization.

660889311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3611481.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 660889311 is about 25707.7675226769. The cubic root of 660889311 is about 871.0496473559.

The spelling of 660889311 in words is "six hundred sixty million, eight hundred eighty-nine thousand, three hundred eleven".