161370661 has 8 divisors (see below), whose sum is σ = 164251584. Its totient is φ = 158508000.

The previous prime is 161370623. The next prime is 161370689. The reversal of 161370661 is 166073161.

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 161370661 - 2¹³ = 161362469 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 (161370611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13920 + ... + 22726.

It is an arithmetic number, because the mean of its divisors is an integer number (20531448).

Almost surely, 2^161370661 is an apocalyptic number.

It is an amenable number.

161370661 is a deficient number, since it is larger than the sum of its proper divisors (2880923).

161370661 is an equidigital number, since it uses as much as digits as its factorization.

161370661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9131.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 161370661 is about 12703.1752329880. The cubic root of 161370661 is about 544.4293451765.

The spelling of 161370661 in words is "one hundred sixty-one million, three hundred seventy thousand, six hundred sixty-one".