161106557 has 8 divisors (see below), whose sum is σ = 162487416. Its totient is φ = 159731712.

The previous prime is 161106541. The next prime is 161106577. The reversal of 161106557 is 755601161.

It can be written as a sum of positive squares in 4 ways, for example, as 3076516 + 158030041 = 1754^2 + 12571^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 161106557 - 2⁴ = 161106541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161106577) 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, 63803 + ... + 66279.

It is an arithmetic number, because the mean of its divisors is an integer number (20310927).

Almost surely, 2^161106557 is an apocalyptic number.

It is an amenable number.

161106557 is a deficient number, since it is larger than the sum of its proper divisors (1380859).

161106557 is a wasteful number, since it uses less digits than its factorization.

161106557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3007.

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 161106557 is about 12692.7757799466. The cubic root of 161106557 is about 544.1321732706.

The spelling of 161106557 in words is "one hundred sixty-one million, one hundred six thousand, five hundred fifty-seven".