22661744640 has 96 divisors (see below), whose sum is σ = 72499976640. Its totient is φ = 6043123712.

The previous prime is 22661744597. The next prime is 22661744647. The reversal of 22661744640 is 4644716622.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 22661744592 and 22661744601.

It is not an unprimeable number, because it can be changed into a prime (22661744647) 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, 338124 + ... + 399563.

It is an arithmetic number, because the mean of its divisors is an integer number (755208090).

Almost surely, 2^22661744640 is an apocalyptic number.

22661744640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22661744640 is an abundant number, since it is smaller than the sum of its proper divisors (49838232000).

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

22661744640 is an equidigital number, since it uses as much as digits as its factorization.

22661744640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737717 (or 737697 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 42.

The spelling of 22661744640 in words is "twenty-two billion, six hundred sixty-one million, seven hundred forty-four thousand, six hundred forty".