18077245381 has 18 divisors (see below), whose sum is σ = 20273195670. Its totient is φ = 16111158336.

The previous prime is 18077245379. The next prime is 18077245387. The reversal of 18077245381 is 18354277081.

It can be written as a sum of positive squares in 9 ways, for example, as 14034193156 + 4043052225 = 118466^2 + 63585^2 .

It is not a de Polignac number, because 18077245381 - 2¹ = 18077245379 is a prime.

It is a super-2 number, since 2×18077245381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18077245387) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 78535 + ... + 205723.

Almost surely, 2^18077245381 is an apocalyptic number.

It is an amenable number.

18077245381 is a deficient number, since it is larger than the sum of its proper divisors (2195950289).

18077245381 is a wasteful number, since it uses less digits than its factorization.

18077245381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127273 (or 127231 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 46.

The spelling of 18077245381 in words is "eighteen billion, seventy-seven million, two hundred forty-five thousand, three hundred eighty-one".