1664936541 has 24 divisors (see below), whose sum is σ = 2579260320. Its totient is φ = 1031692896.

The previous prime is 1664936453. The next prime is 1664936543. The reversal of 1664936541 is 1456394661.

1664936541 is a `hidden beast` number, since 1 + 66 + 49 + 3 + 6 + 541 = 666.

It is not a de Polignac number, because 1664936541 - 2¹⁸ = 1664674397 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664936543) 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, 82791 + ... + 100916.

It is an arithmetic number, because the mean of its divisors is an integer number (107469180).

Almost surely, 2^1664936541 is an apocalyptic number.

It is an amenable number.

1664936541 is a deficient number, since it is larger than the sum of its proper divisors (914323779).

1664936541 is a wasteful number, since it uses less digits than its factorization.

1664936541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183785 (or 183782 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 1664936541 is about 40803.6339190519. The cubic root of 1664936541 is about 1185.2207012951.

The spelling of 1664936541 in words is "one billion, six hundred sixty-four million, nine hundred thirty-six thousand, five hundred forty-one".