11722571644 has 36 divisors (see below), whose sum is σ = 24901372944. Its totient is φ = 4805524416.

The previous prime is 11722571617. The next prime is 11722571659. The reversal of 11722571644 is 44617522711.

It is a junction number, because it is equal to n+sod(n) for n = 11722571597 and 11722571606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1295689 + ... + 1304704.

It is an arithmetic number, because the mean of its divisors is an integer number (691704804).

Almost surely, 2^11722571644 is an apocalyptic number.

11722571644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

11722571644 is an abundant number, since it is smaller than the sum of its proper divisors (13178801300).

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

11722571644 is a wasteful number, since it uses less digits than its factorization.

11722571644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2600434 (or 2600425 counting only the distinct ones).

The product of its digits is 94080, while the sum is 40.

It can be divided in two parts, 1172 and 2571644, that added together give a square (2572816 = 1604²).

The spelling of 11722571644 in words is "eleven billion, seven hundred twenty-two million, five hundred seventy-one thousand, six hundred forty-four".