155166601 has 4 divisors (see below), whose sum is σ = 155214100. Its totient is φ = 155119104.

The previous prime is 155166593. The next prime is 155166619. The reversal of 155166601 is 106661551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54686025 + 100480576 = 7395^2 + 10024^2 .

It is a cyclic number.

It is not a de Polignac number, because 155166601 - 2³ = 155166593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155166691) 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, 18456 + ... + 25513.

It is an arithmetic number, because the mean of its divisors is an integer number (38803525).

Almost surely, 2^155166601 is an apocalyptic number.

It is an amenable number.

155166601 is a deficient number, since it is larger than the sum of its proper divisors (47499).

155166601 is an equidigital number, since it uses as much as digits as its factorization.

155166601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47498.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 155166601 is about 12456.5886582162. The cubic root of 155166601 is about 537.3609242486.

The spelling of 155166601 in words is "one hundred fifty-five million, one hundred sixty-six thousand, six hundred one".