181079021512 has 8 divisors (see below), whose sum is σ = 339523165350. Its totient is φ = 90539510752.

The previous prime is 181079021491. The next prime is 181079021531. The reversal of 181079021512 is 215120970181.

It can be written as a sum of positive squares in only one way, i.e., 150136100676 + 30942920836 = 387474^2 + 175906^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×181079021512² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11317438837 + ... + 11317438852.

Almost surely, 2^181079021512 is an apocalyptic number.

It is an amenable number.

181079021512 is a deficient number, since it is larger than the sum of its proper divisors (158444143838).

181079021512 is a wasteful number, since it uses less digits than its factorization.

181079021512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22634877695 (or 22634877691 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 37.

Adding to 181079021512 its reverse (215120970181), we get a palindrome (396199991693).

The spelling of 181079021512 in words is "one hundred eighty-one billion, seventy-nine million, twenty-one thousand, five hundred twelve".