161697080 has 16 divisors (see below), whose sum is σ = 363818520. Its totient is φ = 64678816.

The previous prime is 161697073. The next prime is 161697091. The reversal of 161697080 is 80796161.

It is a super-2 number, since 2×161697080² = 52291891361052800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2021174 + ... + 2021253.

Almost surely, 2^161697080 is an apocalyptic number.

161697080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161697080 is an abundant number, since it is smaller than the sum of its proper divisors (202121440).

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

161697080 is a wasteful number, since it uses less digits than its factorization.

161697080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4042438 (or 4042434 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 161697080 is about 12716.0166718985. The cubic root of 161697080 is about 544.7961867304.

The spelling of 161697080 in words is "one hundred sixty-one million, six hundred ninety-seven thousand, eighty".