1664608455 has 32 divisors (see below), whose sum is σ = 2961100800. Its totient is φ = 887252256.

The previous prime is 1664608453. The next prime is 1664608507. The reversal of 1664608455 is 5548064661.

1664608455 is a `hidden beast` number, since 1 + 66 + 460 + 84 + 55 = 666.

It is not a de Polignac number, because 1664608455 - 2¹ = 1664608453 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1664608455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664608453) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 327826 + ... + 332864.

It is an arithmetic number, because the mean of its divisors is an integer number (92534400).

Almost surely, 2^1664608455 is an apocalyptic number.

1664608455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1664608455 is a deficient number, since it is larger than the sum of its proper divisors (1296492345).

1664608455 is a wasteful number, since it uses less digits than its factorization.

1664608455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7500 (or 7494 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The square root of 1664608455 is about 40799.6134172862. The cubic root of 1664608455 is about 1185.1428445012.

The spelling of 1664608455 in words is "one billion, six hundred sixty-four million, six hundred eight thousand, four hundred fifty-five".