166605161566156 has 12 divisors (see below), whose sum is σ = 291561480094192. Its totient is φ = 83301881539248.

The previous prime is 166605161566153. The next prime is 166605161566157. The reversal of 166605161566156 is 651665161506661.

It is a happy number.

It is a hoax number, since the sum of its digits (61) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 166605161566094 and 166605161566103.

It is not an unprimeable number, because it can be changed into a prime (166605161566153) 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, 174274680 + ... + 175228063.

Almost surely, 2^{166605161566156} is an apocalyptic number.

It is an amenable number.

166605161566156 is a deficient number, since it is larger than the sum of its proper divisors (124956318528036).

166605161566156 is a wasteful number, since it uses less digits than its factorization.

166605161566156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349621920 (or 349621918 counting only the distinct ones).

The product of its (nonzero) digits is 34992000, while the sum is 61.

The spelling of 166605161566156 in words is "one hundred sixty-six trillion, six hundred five billion, one hundred sixty-one million, five hundred sixty-six thousand, one hundred fifty-six".