161680434 has 16 divisors (see below), whose sum is σ = 323555520. Its totient is φ = 53861040.

The previous prime is 161680427. The next prime is 161680457. The reversal of 161680434 is 434086161.

It is a super-2 number, since 2×161680434² = 52281125476856712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161680395 and 161680404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4104 + ... + 18444.

It is an arithmetic number, because the mean of its divisors is an integer number (20222220).

Almost surely, 2^161680434 is an apocalyptic number.

161680434 is an abundant number, since it is smaller than the sum of its proper divisors (161875086).

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

161680434 is a wasteful number, since it uses less digits than its factorization.

161680434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16225.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 161680434 is about 12715.3621261842. The cubic root of 161680434 is about 544.7774913020. Note that the first 3 decimals are identical.

The spelling of 161680434 in words is "one hundred sixty-one million, six hundred eighty thousand, four hundred thirty-four".