166011561513 has 24 divisors (see below), whose sum is σ = 274502379008. Its totient is φ = 94707444672.

The previous prime is 166011561511. The next prime is 166011561539. The reversal of 166011561513 is 315165110661.

166011561513 is a `hidden beast` number, since 16 + 6 + 0 + 1 + 15 + 615 + 13 = 666.

166011561513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166011561513 - 2¹ = 166011561511 is a prime.

It is a super-3 number, since 3×166011561513³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166011561511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2132356 + ... + 2208837.

Almost surely, 2^166011561513 is an apocalyptic number.

It is an amenable number.

166011561513 is a deficient number, since it is larger than the sum of its proper divisors (108490817495).

166011561513 is a wasteful number, since it uses less digits than its factorization.

166011561513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4341813 (or 4341810 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The spelling of 166011561513 in words is "one hundred sixty-six billion, eleven million, five hundred sixty-one thousand, five hundred thirteen".