18656430237481 has 27 divisors (see below), whose sum is σ = 20316866751727. Its totient is φ = 17127960680960.

The previous prime is 18656430237377. The next prime is 18656430237493. The reversal of 18656430237481 is 18473203465681.

The square root of 18656430237481 is 4319309.

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

It can be written as a sum of positive squares in 13 ways, for example, as 15706486585881 + 2949943651600 = 3963141^2 + 1717540^2 .

It is not a de Polignac number, because 18656430237481 - 2¹³ = 18656430229289 is a prime.

It is a super-2 number, since 2×18656430237481² (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 (18656430237581) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3010555275 + ... + 3010561471.

Almost surely, 2^{18656430237481} is an apocalyptic number.

18656430237481 is the 4319309-th square number.

18656430237481 is the 2159655-th centered octagonal number.

It is an amenable number.

18656430237481 is a deficient number, since it is larger than the sum of its proper divisors (1660436514246).

18656430237481 is an frugal number, since it uses more digits than its factorization.

18656430237481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12510 (or 6255 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 58.

The spelling of 18656430237481 in words is "eighteen trillion, six hundred fifty-six billion, four hundred thirty million, two hundred thirty-seven thousand, four hundred eighty-one".