13455647221636 has 27 divisors (see below), whose sum is σ = 23593447787511. Its totient is φ = 6714687808104.

The previous prime is 13455647221631. The next prime is 13455647221733. The reversal of 13455647221636 is 63612274655431.

The square root of 13455647221636 is 3668194.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×13455647221636² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

Its product of digits (21772800) is a multiple of the sum of its prime divisors (3584).

It is not an unprimeable number, because it can be changed into a prime (13455647221631) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4541222691 + ... + 4541225653.

Almost surely, 2^{13455647221636} is an apocalyptic number.

13455647221636 is the 3668194-th square number.

It is an amenable number.

13455647221636 is a deficient number, since it is larger than the sum of its proper divisors (10137800565875).

13455647221636 is an frugal number, since it uses more digits than its factorization.

13455647221636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7168 (or 3584 counting only the distinct ones).

The product of its digits is 21772800, while the sum is 55.

The spelling of 13455647221636 in words is "thirteen trillion, four hundred fifty-five billion, six hundred forty-seven million, two hundred twenty-one thousand, six hundred thirty-six".