13471973021666 has 4 divisors (see below), whose sum is σ = 20207959532502. Its totient is φ = 6735986510832.

The previous prime is 13471973021629. The next prime is 13471973021671. The reversal of 13471973021666 is 66612037917431.

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

It can be written as a sum of positive squares in only one way, i.e., 11545581698641 + 1926391323025 = 3397879^2 + 1387945^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3367993255415 + ... + 3367993255418.

Almost surely, 2^{13471973021666} is an apocalyptic number.

13471973021666 is a deficient number, since it is larger than the sum of its proper divisors (6735986510836).

13471973021666 is an equidigital number, since it uses as much as digits as its factorization.

13471973021666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6735986510835.

The product of its (nonzero) digits is 6858432, while the sum is 56.

The spelling of 13471973021666 in words is "thirteen trillion, four hundred seventy-one billion, nine hundred seventy-three million, twenty-one thousand, six hundred sixty-six".