181061645457 has 16 divisors (see below), whose sum is σ = 300985592832. Its totient is φ = 94057997520.

The previous prime is 181061645447. The next prime is 181061645489. The reversal of 181061645457 is 754546160181.

It is not a de Polignac number, because 181061645457 - 2⁴ = 181061645441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (181061645447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 391908093 + ... + 391908554.

It is an arithmetic number, because the mean of its divisors is an integer number (18811599552).

Almost surely, 2^181061645457 is an apocalyptic number.

It is an amenable number.

181061645457 is a deficient number, since it is larger than the sum of its proper divisors (119923947375).

181061645457 is a wasteful number, since it uses less digits than its factorization.

181061645457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783816668.

The product of its (nonzero) digits is 806400, while the sum is 48.

The spelling of 181061645457 in words is "one hundred eighty-one billion, sixty-one million, six hundred forty-five thousand, four hundred fifty-seven".