22006400646 has 16 divisors (see below), whose sum is σ = 44029237824. Its totient is φ = 7332727464.

The previous prime is 22006400641. The next prime is 22006400707. The reversal of 22006400646 is 64600460022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22006400641) 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, 667416 + ... + 699611.

It is an arithmetic number, because the mean of its divisors is an integer number (2751827364).

Almost surely, 2^22006400646 is an apocalyptic number.

22006400646 is an abundant number, since it is smaller than the sum of its proper divisors (22022837178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22006400646 is a wasteful number, since it uses less digits than its factorization.

22006400646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369715.

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 22006400646 its reverse (64600460022), we get a palindrome (86606860668).

The spelling of 22006400646 in words is "twenty-two billion, six million, four hundred thousand, six hundred forty-six".