13644574646851 has 4 divisors (see below), whose sum is σ = 14362710154600. Its totient is φ = 12926439139104.

The previous prime is 13644574646849. The next prime is 13644574646881. The reversal of 13644574646851 is 15864647544631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13644574646851 - 2¹ = 13644574646849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13644574646881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359067753846 + ... + 359067753883.

It is an arithmetic number, because the mean of its divisors is an integer number (3590677538650).

Almost surely, 2^{13644574646851} is an apocalyptic number.

13644574646851 is a deficient number, since it is larger than the sum of its proper divisors (718135507749).

13644574646851 is an equidigital number, since it uses as much as digits as its factorization.

13644574646851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718135507748.

The product of its digits is 232243200, while the sum is 64.

The spelling of 13644574646851 in words is "thirteen trillion, six hundred forty-four billion, five hundred seventy-four million, six hundred forty-six thousand, eight hundred fifty-one".