166813660155 has 16 divisors (see below), whose sum is σ = 266907569184. Its totient is φ = 88965381120.

The previous prime is 166813660147. The next prime is 166813660171. The reversal of 166813660155 is 551066318661.

It is not a de Polignac number, because 166813660155 - 2³ = 166813660147 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 870517 + ... + 1044713.

It is an arithmetic number, because the mean of its divisors is an integer number (16681723074).

Almost surely, 2^166813660155 is an apocalyptic number.

166813660155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166813660155 is a deficient number, since it is larger than the sum of its proper divisors (100093909029).

166813660155 is a wasteful number, since it uses less digits than its factorization.

166813660155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238046.

The product of its (nonzero) digits is 777600, while the sum is 48.

The spelling of 166813660155 in words is "one hundred sixty-six billion, eight hundred thirteen million, six hundred sixty thousand, one hundred fifty-five".