22149946561 has 4 divisors (see below), whose sum is σ = 23452884612. Its totient is φ = 20847008512.

The previous prime is 22149946547. The next prime is 22149946583. The reversal of 22149946561 is 16564994122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19949867536 + 2200079025 = 141244^2 + 46905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22149946561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22149946531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651469000 + ... + 651469033.

It is an arithmetic number, because the mean of its divisors is an integer number (5863221153).

Almost surely, 2^22149946561 is an apocalyptic number.

It is an amenable number.

22149946561 is a deficient number, since it is larger than the sum of its proper divisors (1302938051).

22149946561 is a wasteful number, since it uses less digits than its factorization.

22149946561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302938050.

The product of its digits is 933120, while the sum is 49.

The spelling of 22149946561 in words is "twenty-two billion, one hundred forty-nine million, nine hundred forty-six thousand, five hundred sixty-one".