50021561663 has 8 divisors (see below), whose sum is σ = 51642474240. Its totient is φ = 48414805920.

The previous prime is 50021561641. The next prime is 50021561669. The reversal of 50021561663 is 36616512005.

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 50021561663 - 2⁶ = 50021561599 is a prime.

It is a super-2 number, since 2×50021561663² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50021561669) 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, 3532028 + ... + 3546161.

It is an arithmetic number, because the mean of its divisors is an integer number (6455309280).

Almost surely, 2^50021561663 is an apocalyptic number.

50021561663 is a deficient number, since it is larger than the sum of its proper divisors (1620912577).

50021561663 is a wasteful number, since it uses less digits than its factorization.

50021561663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7078417.

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 50021561663 in words is "fifty billion, twenty-one million, five hundred sixty-one thousand, six hundred sixty-three".