161662664 has 8 divisors (see below), whose sum is σ = 303117510. Its totient is φ = 80831328.

The previous prime is 161662663. The next prime is 161662703. The reversal of 161662664 is 466266161.

161662664 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 138062500 + 23600164 = 11750^2 + 4858^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×161662664² = 52269633863153792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161662663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10103909 + ... + 10103924.

Almost surely, 2^161662664 is an apocalyptic number.

It is an amenable number.

161662664 is a deficient number, since it is larger than the sum of its proper divisors (141454846).

161662664 is a wasteful number, since it uses less digits than its factorization.

161662664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20207839 (or 20207835 counting only the distinct ones).

The product of its digits is 62208, while the sum is 38.

The square root of 161662664 is about 12714.6633459168. The cubic root of 161662664 is about 544.7575320725.

The spelling of 161662664 in words is "one hundred sixty-one million, six hundred sixty-two thousand, six hundred sixty-four".