161633641 has 8 divisors (see below), whose sum is σ = 174573504. Its totient is φ = 148766160.

The previous prime is 161633629. The next prime is 161633663. The reversal of 161633641 is 146336161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161633641 - 2⁵ = 161633609 is a prime.

It is a super-2 number, since 2×161633641² = 52250867805833762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161633041) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 13405 + ... + 22426.

It is an arithmetic number, because the mean of its divisors is an integer number (21821688).

Almost surely, 2^161633641 is an apocalyptic number.

It is an amenable number.

161633641 is a deficient number, since it is larger than the sum of its proper divisors (12939863).

161633641 is a wasteful number, since it uses less digits than its factorization.

161633641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36191.

The product of its digits is 7776, while the sum is 31.

The square root of 161633641 is about 12713.5219746536. The cubic root of 161633641 is about 544.7249303496.

The spelling of 161633641 in words is "one hundred sixty-one million, six hundred thirty-three thousand, six hundred forty-one".