1663715664 has 60 divisors (see below), whose sum is σ = 5014259796. Its totient is φ = 511911936.

The previous prime is 1663715653. The next prime is 1663715681. The reversal of 1663715664 is 4665173661.

1663715664 is a `hidden beast` number, since 1 + 6 + 637 + 1 + 5 + 6 + 6 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 306530064 + 1357185600 = 17508^2 + 36840^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 442497 + ... + 446240.

Almost surely, 2^1663715664 is an apocalyptic number.

It is an amenable number.

1663715664 is an abundant number, since it is smaller than the sum of its proper divisors (3350544132).

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

1663715664 is a wasteful number, since it uses less digits than its factorization.

1663715664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888764 (or 888755 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 1663715664 is about 40788.6707800095. The cubic root of 1663715664 is about 1184.9309279827.

The spelling of 1663715664 in words is "one billion, six hundred sixty-three million, seven hundred fifteen thousand, six hundred sixty-four".