166611556101 has 8 divisors (see below), whose sum is σ = 222390473920. Its totient is φ = 110953504512.

The previous prime is 166611556091. The next prime is 166611556103. The reversal of 166611556101 is 101655116661.

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

It is not a de Polignac number, because 166611556101 - 2¹³ = 166611547909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166611556101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166611556103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30213340 + ... + 30218853.

It is an arithmetic number, because the mean of its divisors is an integer number (27798809240).

Almost surely, 2^166611556101 is an apocalyptic number.

It is an amenable number.

166611556101 is a deficient number, since it is larger than the sum of its proper divisors (55778917819).

166611556101 is an equidigital number, since it uses as much as digits as its factorization.

166611556101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60433115.

The product of its (nonzero) digits is 32400, while the sum is 39.

The spelling of 166611556101 in words is "one hundred sixty-six billion, six hundred eleven million, five hundred fifty-six thousand, one hundred one".