1664524642 has 64 divisors (see below), whose sum is σ = 2859929856. Its totient is φ = 726000000.

The previous prime is 1664524637. The next prime is 1664524649. The reversal of 1664524642 is 2464254661.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1664524595 and 1664524604.

It is not an unprimeable number, because it can be changed into a prime (1664524649) 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, 11023267 + ... + 11023417.

It is an arithmetic number, because the mean of its divisors is an integer number (44686404).

Almost surely, 2^1664524642 is an apocalyptic number.

1664524642 is a deficient number, since it is larger than the sum of its proper divisors (1195405214).

1664524642 is a wasteful number, since it uses less digits than its factorization.

1664524642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328 (or 306 counting only the distinct ones).

The product of its digits is 276480, while the sum is 40.

The square root of 1664524642 is about 40798.5862745267. The cubic root of 1664524642 is about 1185.1229535284.

The spelling of 1664524642 in words is "one billion, six hundred sixty-four million, five hundred twenty-four thousand, six hundred forty-two".