1664065956 has 48 divisors (see below), whose sum is σ = 4439546496. Its totient is φ = 475229184.

The previous prime is 1664065951. The next prime is 1664065969. The reversal of 1664065956 is 6595604661.

It is not an unprimeable number, because it can be changed into a prime (1664065951) 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, 301090 + ... + 306566.

It is an arithmetic number, because the mean of its divisors is an integer number (92490552).

Almost surely, 2^1664065956 is an apocalyptic number.

It is an amenable number.

1664065956 is an abundant number, since it is smaller than the sum of its proper divisors (2775480540).

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

1664065956 is a wasteful number, since it uses less digits than its factorization.

1664065956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9108 (or 9106 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 48.

The square root of 1664065956 is about 40792.9645404695. The cubic root of 1664065956 is about 1185.0140837579.

The spelling of 1664065956 in words is "one billion, six hundred sixty-four million, sixty-five thousand, nine hundred fifty-six".