45181331523 has 36 divisors (see below), whose sum is σ = 70676460120. Its totient is φ = 28522323936.

The previous prime is 45181331501. The next prime is 45181331549. The reversal of 45181331523 is 32513318154.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

45181331523 is a `hidden beast` number, since 4 + 51 + 81 + 3 + 3 + 1 + 523 = 666.

It is not a de Polignac number, because 45181331523 - 2⁸ = 45181331267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (45181331323) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20984215 + ... + 20986367.

Almost surely, 2^45181331523 is an apocalyptic number.

45181331523 is a deficient number, since it is larger than the sum of its proper divisors (25495128597).

45181331523 is an frugal number, since it uses more digits than its factorization.

45181331523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4353 (or 2175 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

Adding to 45181331523 its reverse (32513318154), we get a palindrome (77694649677).

The spelling of 45181331523 in words is "forty-five billion, one hundred eighty-one million, three hundred thirty-one thousand, five hundred twenty-three".