161637682 has 8 divisors (see below), whose sum is σ = 249009516. Its totient is φ = 78634512.

The previous prime is 161637667. The next prime is 161637709. The reversal of 161637682 is 286736161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 160807761 + 829921 = 12681^2 + 911^2 .

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

It is a super-3 number, since 3×161637682³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1092073 + ... + 1092220.

Almost surely, 2^161637682 is an apocalyptic number.

161637682 is a deficient number, since it is larger than the sum of its proper divisors (87371834).

161637682 is a wasteful number, since it uses less digits than its factorization.

161637682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2184332.

The product of its digits is 72576, while the sum is 40.

The square root of 161637682 is about 12713.6808989372. The cubic root of 161637682 is about 544.7294698648.

The spelling of 161637682 in words is "one hundred sixty-one million, six hundred thirty-seven thousand, six hundred eighty-two".