20056521663 has 12 divisors (see below), whose sum is σ = 30230119920. Its totient is φ = 12789665856.

The previous prime is 20056521649. The next prime is 20056521743. The reversal of 20056521663 is 36612565002.

It is a happy number.

20056521663 is a `hidden beast` number, since 20 + 0 + 56 + 521 + 6 + 63 = 666.

It is not a de Polignac number, because 20056521663 - 2⁵ = 20056521631 is a prime.

It is a super-2 number, since 2×20056521663² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20056520663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48445498 + ... + 48445911.

It is an arithmetic number, because the mean of its divisors is an integer number (2519176660).

Almost surely, 2^20056521663 is an apocalyptic number.

20056521663 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20056521663 is a deficient number, since it is larger than the sum of its proper divisors (10173598257).

20056521663 is a wasteful number, since it uses less digits than its factorization.

20056521663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96891438 (or 96891435 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 20056521663 in words is "twenty billion, fifty-six million, five hundred twenty-one thousand, six hundred sixty-three".