161674905 has 32 divisors (see below), whose sum is σ = 296644608. Its totient is φ = 73656000.

The previous prime is 161674861. The next prime is 161674907. The reversal of 161674905 is 509476161.

It is not a de Polignac number, because 161674905 - 2¹¹ = 161672857 is a prime.

It is a super-2 number, since 2×161674905² = 52277549813518050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161674907) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30180 + ... + 35130.

It is an arithmetic number, because the mean of its divisors is an integer number (9270144).

Almost surely, 2^161674905 is an apocalyptic number.

161674905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161674905 is a deficient number, since it is larger than the sum of its proper divisors (134969703).

161674905 is a wasteful number, since it uses less digits than its factorization.

161674905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5277.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 161674905 is about 12715.1447101478. The cubic root of 161674905 is about 544.7712812967.

The spelling of 161674905 in words is "one hundred sixty-one million, six hundred seventy-four thousand, nine hundred five".