18307196673481 has 3 divisors (see below), whose sum is σ = 18307200952173. Its totient is φ = 18307192394790.

The previous prime is 18307196673407. The next prime is 18307196673497. The reversal of 18307196673481 is 18437669170381.

The square root of 18307196673481 is 4278691.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 18307196673481 - 2⁹ = 18307196672969 is a prime.

It is a super-2 number, since 2×18307196673481² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18307196673781) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2139346 + ... + 6418036.

It is an arithmetic number, because the mean of its divisors is an integer number (6102400317391).

Almost surely, 2^{18307196673481} is an apocalyptic number.

18307196673481 is the 4278691-st square number.

18307196673481 is the 2139346-th centered octagonal number.

It is an amenable number.

18307196673481 is a deficient number, since it is larger than the sum of its proper divisors (4278692).

18307196673481 is an frugal number, since it uses more digits than its factorization.

18307196673481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8557382 (or 4278691 counting only the distinct ones).

The product of its (nonzero) digits is 36578304, while the sum is 64.

The spelling of 18307196673481 in words is "eighteen trillion, three hundred seven billion, one hundred ninety-six million, six hundred seventy-three thousand, four hundred eighty-one".