181405289601 has 6 divisors (see below), whose sum is σ = 262029862770. Its totient is φ = 120936859728.

The previous prime is 181405289587. The next prime is 181405289621. The reversal of 181405289601 is 106982504181.

It is a happy number.

181405289601 is a `hidden beast` number, since 1 + 8 + 14 + 0 + 5 + 28 + 9 + 601 = 666.

It can be written as a sum of positive squares in only one way, i.e., 144038466576 + 37366823025 = 379524^2 + 193305^2 .

It is not a de Polignac number, because 181405289601 - 2²¹ = 181403192449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (181405289621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10078071636 + ... + 10078071653.

It is an arithmetic number, because the mean of its divisors is an integer number (43671643795).

Almost surely, 2^181405289601 is an apocalyptic number.

It is an amenable number.

181405289601 is a deficient number, since it is larger than the sum of its proper divisors (80624573169).

181405289601 is a wasteful number, since it uses less digits than its factorization.

181405289601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20156143295 (or 20156143292 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The spelling of 181405289601 in words is "one hundred eighty-one billion, four hundred five million, two hundred eighty-nine thousand, six hundred one".