22643433561 has 24 divisors (see below), whose sum is σ = 35286923424. Its totient is φ = 12877764480.

The previous prime is 22643433557. The next prime is 22643433563. The reversal of 22643433561 is 16533434622.

It is not a de Polignac number, because 22643433561 - 2² = 22643433557 is a prime.

It is a super-2 number, since 2×22643433561² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22643433563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 334000 + ... + 396033.

It is an arithmetic number, because the mean of its divisors is an integer number (1470288476).

Almost surely, 2^22643433561 is an apocalyptic number.

22643433561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22643433561 is a deficient number, since it is larger than the sum of its proper divisors (12643489863).

22643433561 is a wasteful number, since it uses less digits than its factorization.

22643433561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730261 (or 730254 counting only the distinct ones).

The product of its digits is 311040, while the sum is 39.

The spelling of 22643433561 in words is "twenty-two billion, six hundred forty-three million, four hundred thirty-three thousand, five hundred sixty-one".