1217771660 has 24 divisors (see below), whose sum is σ = 2922652320. Its totient is φ = 417521664.

The previous prime is 1217771657. The next prime is 1217771669. The reversal of 1217771660 is 661777121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1217771669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4349045 + ... + 4349324.

It is an arithmetic number, because the mean of its divisors is an integer number (121777180).

Almost surely, 2^1217771660 is an apocalyptic number.

1217771660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1217771660 is an abundant number, since it is smaller than the sum of its proper divisors (1704880660).

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

1217771660 is a wasteful number, since it uses less digits than its factorization.

1217771660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8698385 (or 8698383 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 38.

The square root of 1217771660 is about 34896.5852197604. The cubic root of 1217771660 is about 1067.8787742256.

The spelling of 1217771660 in words is "one billion, two hundred seventeen million, seven hundred seventy-one thousand, six hundred sixty".