1663664406 has 16 divisors (see below), whose sum is σ = 3328081344. Its totient is φ = 554429384.

The previous prime is 1663664399. The next prime is 1663664413. The reversal of 1663664406 is 6044663661.

It is an interprime number because it is at equal distance from previous prime (1663664399) and next prime (1663664413).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240 + ... + 57683.

It is an arithmetic number, because the mean of its divisors is an integer number (208005084).

Almost surely, 2^1663664406 is an apocalyptic number.

1663664406 is an abundant number, since it is smaller than the sum of its proper divisors (1664416938).

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

1663664406 is a wasteful number, since it uses less digits than its factorization.

1663664406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62715.

The product of its (nonzero) digits is 373248, while the sum is 42.

The square root of 1663664406 is about 40788.0424389306. The cubic root of 1663664406 is about 1184.9187588734.

The spelling of 1663664406 in words is "one billion, six hundred sixty-three million, six hundred sixty-four thousand, four hundred six".