20615633663 has 8 divisors (see below), whose sum is σ = 21099820368. Its totient is φ = 20131663104.

The previous prime is 20615633659. The next prime is 20615633699. The reversal of 20615633663 is 36633651602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20615633663 - 2² = 20615633659 is a prime.

It is a super-3 number, since 3×20615633663³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20615633663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20615633603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147695 + ... + 251087.

It is an arithmetic number, because the mean of its divisors is an integer number (2637477546).

Almost surely, 2^20615633663 is an apocalyptic number.

20615633663 is a deficient number, since it is larger than the sum of its proper divisors (484186705).

20615633663 is a wasteful number, since it uses less digits than its factorization.

20615633663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108073.

The product of its (nonzero) digits is 349920, while the sum is 41.

The spelling of 20615633663 in words is "twenty billion, six hundred fifteen million, six hundred thirty-three thousand, six hundred sixty-three".