1223001660 has 24 divisors (see below), whose sum is σ = 3424404816. Its totient is φ = 326133760.

The previous prime is 1223001653. The next prime is 1223001673. The reversal of 1223001660 is 661003221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10191621 + ... + 10191740.

It is an arithmetic number, because the mean of its divisors is an integer number (142683534).

Almost surely, 2^1223001660 is an apocalyptic number.

1223001660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223001660 is an abundant number, since it is smaller than the sum of its proper divisors (2201403156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1223001660 is a wasteful number, since it uses less digits than its factorization.

1223001660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20383373 (or 20383371 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1223001660 is about 34971.4406337514. The cubic root of 1223001660 is about 1069.4053411048.

Adding to 1223001660 its reverse (661003221), we get a palindrome (1884004881).

The spelling of 1223001660 in words is "one billion, two hundred twenty-three million, one thousand, six hundred sixty".