166557606155 has 8 divisors (see below), whose sum is σ = 206316518784. Its totient is φ = 128947824000.

The previous prime is 166557606121. The next prime is 166557606161. The reversal of 166557606155 is 551606755661.

166557606155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166557606155 - 2⁸ = 166557605899 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166557606097 and 166557606106.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 537282446 + ... + 537282755.

It is an arithmetic number, because the mean of its divisors is an integer number (25789564848).

Almost surely, 2^166557606155 is an apocalyptic number.

166557606155 is a deficient number, since it is larger than the sum of its proper divisors (39758912629).

166557606155 is a wasteful number, since it uses less digits than its factorization.

166557606155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074565237.

The product of its (nonzero) digits is 5670000, while the sum is 53.

The spelling of 166557606155 in words is "one hundred sixty-six billion, five hundred fifty-seven million, six hundred six thousand, one hundred fifty-five".