660526989 has 8 divisors (see below), whose sum is σ = 880825920. Its totient is φ = 440289696.

The previous prime is 660526957. The next prime is 660527003. The reversal of 660526989 is 989625066.

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

It is not a de Polignac number, because 660526989 - 2⁵ = 660526957 is a prime.

It is a super-2 number, since 2×660526989² = 872591806394812242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660521989) 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, 23992 + ... + 43550.

It is an arithmetic number, because the mean of its divisors is an integer number (110103240).

Almost surely, 2^660526989 is an apocalyptic number.

It is an amenable number.

660526989 is a deficient number, since it is larger than the sum of its proper divisors (220298931).

660526989 is a wasteful number, since it uses less digits than its factorization.

660526989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30819.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The square root of 660526989 is about 25700.7196202752. The cubic root of 660526989 is about 870.8904385762.

The spelling of 660526989 in words is "six hundred sixty million, five hundred twenty-six thousand, nine hundred eighty-nine".