1664342163 has 24 divisors (see below), whose sum is σ = 2628924480. Its totient is φ = 1006259760.

The previous prime is 1664342137. The next prime is 1664342189. The reversal of 1664342163 is 3612434661.

1664342163 is a `hidden beast` number, since 1 + 6 + 6 + 434 + 216 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (1664342137) and next prime (1664342189).

It is not a de Polignac number, because 1664342163 - 2¹⁷ = 1664211091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1664342263) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21420 + ... + 61542.

It is an arithmetic number, because the mean of its divisors is an integer number (109538520).

Almost surely, 2^1664342163 is an apocalyptic number.

1664342163 is a deficient number, since it is larger than the sum of its proper divisors (964582317).

1664342163 is a wasteful number, since it uses less digits than its factorization.

1664342163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40559 (or 40556 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 1664342163 is about 40796.3498734875. The cubic root of 1664342163 is about 1185.0796442758.

The spelling of 1664342163 in words is "one billion, six hundred sixty-four million, three hundred forty-two thousand, one hundred sixty-three".