145603681281 has 12 divisors (see below), whose sum is σ = 210337575552. Its totient is φ = 97059360696.

The previous prime is 145603681253. The next prime is 145603681303. The reversal of 145603681281 is 182186306541.

145603681281 is a `hidden beast` number, since 1 + 4 + 5 + 6 + 0 + 368 + 1 + 281 = 666.

It is not a de Polignac number, because 145603681281 - 2¹¹ = 145603679233 is a prime.

It is a super-2 number, since 2×145603681281² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145603681211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 718281 + ... + 898406.

It is an arithmetic number, because the mean of its divisors is an integer number (17528131296).

Almost surely, 2^145603681281 is an apocalyptic number.

It is an amenable number.

145603681281 is a deficient number, since it is larger than the sum of its proper divisors (64733894271).

145603681281 is a wasteful number, since it uses less digits than its factorization.

145603681281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626700 (or 1626697 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 145603681281 in words is "one hundred forty-five billion, six hundred three million, six hundred eighty-one thousand, two hundred eighty-one".