161686632 has 16 divisors (see below), whose sum is σ = 404216640. Its totient is φ = 53895536.

The previous prime is 161686631. The next prime is 161686639. The reversal of 161686632 is 236686161.

It is a super-2 number, since 2×161686632² = 52285133935006848, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (161686631) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3368448 + ... + 3368495.

It is an arithmetic number, because the mean of its divisors is an integer number (25263540).

Almost surely, 2^161686632 is an apocalyptic number.

161686632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161686632 is an abundant number, since it is smaller than the sum of its proper divisors (242530008).

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

161686632 is a wasteful number, since it uses less digits than its factorization.

161686632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6736952 (or 6736948 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 161686632 is about 12715.6058447877. The cubic root of 161686632 is about 544.7844525396.

The spelling of 161686632 in words is "one hundred sixty-one million, six hundred eighty-six thousand, six hundred thirty-two".