166111557 has 8 divisors (see below), whose sum is σ = 221678784. Its totient is φ = 110642688.

The previous prime is 166111553. The next prime is 166111577. The reversal of 166111557 is 755111661.

166111557 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 166111557 - 2² = 166111553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166111553) 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, 20553 + ... + 27470.

It is an arithmetic number, because the mean of its divisors is an integer number (27709848).

Almost surely, 2^166111557 is an apocalyptic number.

It is an amenable number.

166111557 is a deficient number, since it is larger than the sum of its proper divisors (55567227).

166111557 is a wasteful number, since it uses less digits than its factorization.

166111557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49179.

The product of its digits is 6300, while the sum is 33.

The square root of 166111557 is about 12888.4272508324. The cubic root of 166111557 is about 549.7095513276.

The spelling of 166111557 in words is "one hundred sixty-six million, one hundred eleven thousand, five hundred fifty-seven".