161679506 has 4 divisors (see below), whose sum is σ = 242519262. Its totient is φ = 80839752.

The previous prime is 161679481. The next prime is 161679533. The reversal of 161679506 is 605976161.

161679506 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 605976161 = 7 ⋅86568023.

It can be written as a sum of positive squares in only one way, i.e., 161671225 + 8281 = 12715^2 + 91^2 .

It is a super-2 number, since 2×161679506² = 52280525320808072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40419875 + ... + 40419878.

Almost surely, 2^161679506 is an apocalyptic number.

161679506 is a deficient number, since it is larger than the sum of its proper divisors (80839756).

161679506 is an equidigital number, since it uses as much as digits as its factorization.

161679506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80839755.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 161679506 is about 12715.3256348392. The cubic root of 161679506 is about 544.7764490104.

The spelling of 161679506 in words is "one hundred sixty-one million, six hundred seventy-nine thousand, five hundred six".