1220476665 has 64 divisors (see below), whose sum is σ = 2148636672. Its totient is φ = 588902400.

The previous prime is 1220476639. The next prime is 1220476667. The reversal of 1220476665 is 5666740221.

It is not a de Polignac number, because 1220476665 - 2¹¹ = 1220474617 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1220476667) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1430379 + ... + 1431231.

It is an arithmetic number, because the mean of its divisors is an integer number (33572448).

Almost surely, 2^1220476665 is an apocalyptic number.

1220476665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220476665 is a deficient number, since it is larger than the sum of its proper divisors (928160007).

1220476665 is a wasteful number, since it uses less digits than its factorization.

1220476665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090.

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 1220476665 is about 34935.3211664069. The cubic root of 1220476665 is about 1068.6688734289.

The spelling of 1220476665 in words is "one billion, two hundred twenty million, four hundred seventy-six thousand, six hundred sixty-five".