181146564138 has 32 divisors (see below), whose sum is σ = 366753925440. Its totient is φ = 59641577600.

The previous prime is 181146564127. The next prime is 181146564161. The reversal of 181146564138 is 831465641181.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102795 + ... + 610622.

It is an arithmetic number, because the mean of its divisors is an integer number (11461060170).

Almost surely, 2^181146564138 is an apocalyptic number.

181146564138 is an abundant number, since it is smaller than the sum of its proper divisors (185607361302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181146564138 is a wasteful number, since it uses less digits than its factorization.

181146564138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713942.

The product of its digits is 552960, while the sum is 48.

The spelling of 181146564138 in words is "one hundred eighty-one billion, one hundred forty-six million, five hundred sixty-four thousand, one hundred thirty-eight".