161660444 has 12 divisors (see below), whose sum is σ = 308624568. Its totient is φ = 73482000.

The previous prime is 161660423. The next prime is 161660479. The reversal of 161660444 is 444066161.

161660444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161660444² = 52268198308554272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161660444.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1837007 + ... + 1837094.

It is an arithmetic number, because the mean of its divisors is an integer number (25718714).

Almost surely, 2^161660444 is an apocalyptic number.

It is an amenable number.

161660444 is a deficient number, since it is larger than the sum of its proper divisors (146964124).

161660444 is a wasteful number, since it uses less digits than its factorization.

161660444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3674116 (or 3674114 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 161660444 is about 12714.5760448392. The cubic root of 161660444 is about 544.7550384700.

The spelling of 161660444 in words is "one hundred sixty-one million, six hundred sixty thousand, four hundred forty-four".