1663206534 has 80 divisors (see below), whose sum is σ = 4279682880. Its totient is φ = 477465840.

The previous prime is 1663206481. The next prime is 1663206557. The reversal of 1663206534 is 4356023661.

1663206534 is a `hidden beast` number, since 16 + 632 + 0 + 6 + 5 + 3 + 4 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9297 + ... + 58419.

It is an arithmetic number, because the mean of its divisors is an integer number (53496036).

Almost surely, 2^1663206534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1663206534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2139841440).

1663206534 is an abundant number, since it is smaller than the sum of its proper divisors (2616476346).

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

1663206534 is a wasteful number, since it uses less digits than its factorization.

1663206534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49167 (or 49158 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 1663206534 is about 40782.4292312265. The cubic root of 1663206534 is about 1184.8100448603.

The spelling of 1663206534 in words is "one billion, six hundred sixty-three million, two hundred six thousand, five hundred thirty-four".