660389498409 has 16 divisors (see below), whose sum is σ = 881160069888. Its totient is φ = 439939397712.

The previous prime is 660389498371. The next prime is 660389498429. The reversal of 660389498409 is 904894983066.

It is not a de Polignac number, because 660389498409 - 2¹² = 660389494313 is a prime.

It is a super-2 number, since 2×660389498409² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 660389498409.

It is not an unprimeable number, because it can be changed into a prime (660389498429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40193254 + ... + 40209680.

It is an arithmetic number, because the mean of its divisors is an integer number (55072504368).

Almost surely, 2^660389498409 is an apocalyptic number.

It is an amenable number.

660389498409 is a deficient number, since it is larger than the sum of its proper divisors (220770571479).

660389498409 is a wasteful number, since it uses less digits than its factorization.

660389498409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25364.

The product of its (nonzero) digits is 80621568, while the sum is 66.

The spelling of 660389498409 in words is "six hundred sixty billion, three hundred eighty-nine million, four hundred ninety-eight thousand, four hundred nine".