161697654 has 32 divisors (see below), whose sum is σ = 360000000. Its totient is φ = 53798472.

The previous prime is 161697611. The next prime is 161697661. The reversal of 161697654 is 456796161.

It is a super-2 number, since 2×161697654² = 52292262618207432, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29847 + ... + 34845.

It is an arithmetic number, because the mean of its divisors is an integer number (11250000).

Almost surely, 2^161697654 is an apocalyptic number.

161697654 is an abundant number, since it is smaller than the sum of its proper divisors (198302346).

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

161697654 is a wasteful number, since it uses less digits than its factorization.

161697654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5609 (or 5603 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 161697654 is about 12716.0392418394. The cubic root of 161697654 is about 544.7968313775.

The spelling of 161697654 in words is "one hundred sixty-one million, six hundred ninety-seven thousand, six hundred fifty-four".