161864642 has 8 divisors (see below), whose sum is σ = 248443536. Its totient is φ = 79050132.

The previous prime is 161864623. The next prime is 161864653. The reversal of 161864642 is 246468161.

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

It is a super-5 number, since 5×161864642⁵ (a number of 42 digits) contains 55555 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161864596 and 161864605.

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, 940988 + ... + 941159.

It is an arithmetic number, because the mean of its divisors is an integer number (31055442).

Almost surely, 2^161864642 is an apocalyptic number.

161864642 is a deficient number, since it is larger than the sum of its proper divisors (86578894).

161864642 is a wasteful number, since it uses less digits than its factorization.

161864642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1882192.

The product of its digits is 55296, while the sum is 38.

The square root of 161864642 is about 12722.6035857445. The cubic root of 161864642 is about 544.9843072664.

The spelling of 161864642 in words is "one hundred sixty-one million, eight hundred sixty-four thousand, six hundred forty-two".