181657066008445 has 12 divisors (see below), whose sum is σ = 227878315699356. Its totient is φ = 139007146160960.

The previous prime is 181657066008437. The next prime is 181657066008479. The reversal of 181657066008445 is 544800660756181.

It can be written as a sum of positive squares in 2 ways, for example, as 19540484293444 + 162116581715001 = 4420462^2 + 12732501^2 .

It is not a de Polignac number, because 181657066008445 - 2³ = 181657066008437 is a prime.

It is a super-2 number, since 2×181657066008445² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34339707376 + ... + 34339712665.

It is an arithmetic number, because the mean of its divisors is an integer number (18989859641613).

Almost surely, 2^{181657066008445} is an apocalyptic number.

It is an amenable number.

181657066008445 is a deficient number, since it is larger than the sum of its proper divisors (46221249690911).

181657066008445 is an equidigital number, since it uses as much as digits as its factorization.

181657066008445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68679420092 (or 68679420069 counting only the distinct ones).

The product of its (nonzero) digits is 38707200, while the sum is 61.

The spelling of 181657066008445 in words is "one hundred eighty-one trillion, six hundred fifty-seven billion, sixty-six million, eight thousand, four hundred forty-five".