1664255361 has 16 divisors (see below), whose sum is σ = 2234331008. Its totient is φ = 1101859200.

The previous prime is 1664255311. The next prime is 1664255401. The reversal of 1664255361 is 1635524661.

It is not a de Polignac number, because 1664255361 - 2¹⁰ = 1664254337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664255311) 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, 507156 + ... + 510426.

It is an arithmetic number, because the mean of its divisors is an integer number (139645688).

Almost surely, 2^1664255361 is an apocalyptic number.

It is an amenable number.

1664255361 is a deficient number, since it is larger than the sum of its proper divisors (570075647).

1664255361 is a wasteful number, since it uses less digits than its factorization.

1664255361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4392.

The product of its digits is 129600, while the sum is 39.

The square root of 1664255361 is about 40795.2860144404. The cubic root of 1664255361 is about 1185.0590417270.

The spelling of 1664255361 in words is "one billion, six hundred sixty-four million, two hundred fifty-five thousand, three hundred sixty-one".