161660554 has 8 divisors (see below), whose sum is σ = 264535488. Its totient is φ = 73482060.

The previous prime is 161660519. The next prime is 161660557. The reversal of 161660554 is 455066161.

It is a happy number.

161660554 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 a super-2 number, since 2×161660554² = 52268269439173832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161660557) 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, 3674082 + ... + 3674125.

It is an arithmetic number, because the mean of its divisors is an integer number (33066936).

Almost surely, 2^161660554 is an apocalyptic number.

161660554 is a deficient number, since it is larger than the sum of its proper divisors (102874934).

161660554 is a wasteful number, since it uses less digits than its factorization.

161660554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7348220.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 161660554 is about 12714.5803705824. The cubic root of 161660554 is about 544.7551620274.

The spelling of 161660554 in words is "one hundred sixty-one million, six hundred sixty thousand, five hundred fifty-four".