161679906 has 48 divisors (see below), whose sum is σ = 359783424. Its totient is φ = 52448832.

The previous prime is 161679887. The next prime is 161679919. The reversal of 161679906 is 609976161.

It is a super-2 number, since 2×161679906² = 52280784008337672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 188230 + ... + 189086.

It is an arithmetic number, because the mean of its divisors is an integer number (7495488).

Almost surely, 2^161679906 is an apocalyptic number.

161679906 is an abundant number, since it is smaller than the sum of its proper divisors (198103518).

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

161679906 is a wasteful number, since it uses less digits than its factorization.

161679906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135 (or 1132 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 161679906 is about 12715.3413638801. The cubic root of 161679906 is about 544.7768982745.

The spelling of 161679906 in words is "one hundred sixty-one million, six hundred seventy-nine thousand, nine hundred six".