13455426166621 has 6 divisors (see below), whose sum is σ = 14200879140222. Its totient is φ = 12747245841720.

The previous prime is 13455426166601. The next prime is 13455426166631. The reversal of 13455426166621 is 12666162455431.

It can be written as a sum of positive squares in only one way, i.e., 13435604342521 + 19821824100 = 3665461^2 + 140790^2 .

It is not a de Polignac number, because 13455426166621 - 2¹¹ = 13455426164573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13455426166601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18636323970 + ... + 18636324691.

It is an arithmetic number, because the mean of its divisors is an integer number (2366813190037).

Almost surely, 2^{13455426166621} is an apocalyptic number.

It is an amenable number.

13455426166621 is a deficient number, since it is larger than the sum of its proper divisors (745452973601).

13455426166621 is an equidigital number, since it uses as much as digits as its factorization.

13455426166621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37272648699 (or 37272648680 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 52.

The spelling of 13455426166621 in words is "thirteen trillion, four hundred fifty-five billion, four hundred twenty-six million, one hundred sixty-six thousand, six hundred twenty-one".