13661721622 has 16 divisors (see below), whose sum is σ = 20715301152. Its totient is φ = 6756773760.

The previous prime is 13661721599. The next prime is 13661721629. The reversal of 13661721622 is 22612716631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13661721629) 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, 143848 + ... + 219124.

It is an arithmetic number, because the mean of its divisors is an integer number (1294706322).

Almost surely, 2^13661721622 is an apocalyptic number.

13661721622 is a deficient number, since it is larger than the sum of its proper divisors (7053579530).

13661721622 is a wasteful number, since it uses less digits than its factorization.

13661721622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76263.

The product of its digits is 36288, while the sum is 37.

The spelling of 13661721622 in words is "thirteen billion, six hundred sixty-one million, seven hundred twenty-one thousand, six hundred twenty-two".