13561431351645 has 16 divisors (see below), whose sum is σ = 21698367305472. Its totient is φ = 7232737673280.

The previous prime is 13561431351623. The next prime is 13561431351659. The reversal of 13561431351645 is 54615313416531.

It is not a de Polignac number, because 13561431351645 - 2⁵ = 13561431351613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13561431351594 and 13561431351603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3220380 + ... + 6123210.

It is an arithmetic number, because the mean of its divisors is an integer number (1356147956592).

Almost surely, 2^{13561431351645} is an apocalyptic number.

13561431351645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13561431351645 is a deficient number, since it is larger than the sum of its proper divisors (8136935953827).

13561431351645 is a wasteful number, since it uses less digits than its factorization.

13561431351645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3214292.

The product of its digits is 1944000, while the sum is 48.

The spelling of 13561431351645 in words is "thirteen trillion, five hundred sixty-one billion, four hundred thirty-one million, three hundred fifty-one thousand, six hundred forty-five".