161630858 has 8 divisors (see below), whose sum is σ = 243368928. Its totient is φ = 80507884.

The previous prime is 161630857. The next prime is 161630893. The reversal of 161630858 is 858036161.

It is a happy number.

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

It is a super-2 number, since 2×161630858² = 52249068515632328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161630857) 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, 153116 + ... + 154167.

It is an arithmetic number, because the mean of its divisors is an integer number (30421116).

Almost surely, 2^161630858 is an apocalyptic number.

161630858 is a deficient number, since it is larger than the sum of its proper divisors (81738070).

161630858 is a wasteful number, since it uses less digits than its factorization.

161630858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307548.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 161630858 is about 12713.4125237876. The cubic root of 161630858 is about 544.7218039828.

The spelling of 161630858 in words is "one hundred sixty-one million, six hundred thirty thousand, eight hundred fifty-eight".