161642659 has 8 divisors (see below), whose sum is σ = 166307600. Its totient is φ = 157044096.

The previous prime is 161642641. The next prime is 161642731. The reversal of 161642659 is 956246161.

It is a happy number.

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 161642659 - 2⁹ = 161642147 is a prime.

It is a super-2 number, since 2×161642659² = 52256698417180562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161642609) 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, 11634 + ... + 21415.

It is an arithmetic number, because the mean of its divisors is an integer number (20788450).

Almost surely, 2^161642659 is an apocalyptic number.

161642659 is a deficient number, since it is larger than the sum of its proper divisors (4664941).

161642659 is an equidigital number, since it uses as much as digits as its factorization.

161642659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33189.

The product of its digits is 77760, while the sum is 40.

The square root of 161642659 is about 12713.8766314606. The cubic root of 161642659 is about 544.7350607450.

The spelling of 161642659 in words is "one hundred sixty-one million, six hundred forty-two thousand, six hundred fifty-nine".