161638349930 has 16 divisors (see below), whose sum is σ = 290954004480. Its totient is φ = 64654234512.

The previous prime is 161638349903. The next prime is 161638349969. The reversal of 161638349930 is 39943836161.

161638349930 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161638349930² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 744311 + ... + 936629.

It is an arithmetic number, because the mean of its divisors is an integer number (18184625280).

Almost surely, 2^161638349930 is an apocalyptic number.

161638349930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161638349930 is a deficient number, since it is larger than the sum of its proper divisors (129315654550).

161638349930 is a wasteful number, since it uses less digits than its factorization.

161638349930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276373.

The product of its (nonzero) digits is 2519424, while the sum is 53.

The spelling of 161638349930 in words is "one hundred sixty-one billion, six hundred thirty-eight million, three hundred forty-nine thousand, nine hundred thirty".