161647866 has 32 divisors (see below), whose sum is σ = 380350080. Its totient is φ = 50712768.

The previous prime is 161647861. The next prime is 161647867. The reversal of 161647866 is 668746161.

161647866 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 2×161647866² = 52260065164707912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161647861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87126 + ... + 88961.

It is an arithmetic number, because the mean of its divisors is an integer number (11885940).

Almost surely, 2^161647866 is an apocalyptic number.

161647866 is an abundant number, since it is smaller than the sum of its proper divisors (218702214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161647866 is a wasteful number, since it uses less digits than its factorization.

161647866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176115 (or 176109 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 161647866 is about 12714.0814060631. The cubic root of 161647866 is about 544.7409098713.

The spelling of 161647866 in words is "one hundred sixty-one million, six hundred forty-seven thousand, eight hundred sixty-six".