1664360406 has 32 divisors (see below), whose sum is σ = 3709098720. Its totient is φ = 553208832.

The previous prime is 1664360393. The next prime is 1664360407. The reversal of 1664360406 is 6040634661.

1664360406 is a `hidden beast` number, since 1 + 6 + 6 + 43 + 604 + 0 + 6 = 666.

It is a super-2 number, since 2×1664360406² = 5540191122120969672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664360407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24595 + ... + 62718.

It is an arithmetic number, because the mean of its divisors is an integer number (115909335).

Almost surely, 2^1664360406 is an apocalyptic number.

1664360406 is an abundant number, since it is smaller than the sum of its proper divisors (2044738314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1664360406 is a wasteful number, since it uses less digits than its factorization.

1664360406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87677 (or 87671 counting only the distinct ones).

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

The square root of 1664360406 is about 40796.5734590541. The cubic root of 1664360406 is about 1185.0839741805.

The spelling of 1664360406 in words is "one billion, six hundred sixty-four million, three hundred sixty thousand, four hundred six".