166011561512 has 16 divisors (see below), whose sum is σ = 311403775860. Its totient is φ = 82970554624.

The previous prime is 166011561511. The next prime is 166011561539. The reversal of 166011561512 is 215165110661.

It is a happy number.

166011561512 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 161255252356 + 4756309156 = 401566^2 + 68966^2 .

It is a super-2 number, since 2×166011561512² (a number of 23 digits) contains 22 as substring.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4383233 + ... + 4420944.

Almost surely, 2^166011561512 is an apocalyptic number.

It is an amenable number.

166011561512 is a deficient number, since it is larger than the sum of its proper divisors (145392214348).

166011561512 is a wasteful number, since it uses less digits than its factorization.

166011561512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8806540 (or 8806536 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 35.

The spelling of 166011561512 in words is "one hundred sixty-six billion, eleven million, five hundred sixty-one thousand, five hundred twelve".