161816690 has 16 divisors (see below), whose sum is σ = 332880192. Its totient is φ = 55479984.

The previous prime is 161816687. The next prime is 161816701. The reversal of 161816690 is 96618161.

161816690 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161816690² = 52369282325112200, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1155764 + ... + 1155903.

It is an arithmetic number, because the mean of its divisors is an integer number (20805012).

Almost surely, 2^161816690 is an apocalyptic number.

161816690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161816690 is an abundant number, since it is smaller than the sum of its proper divisors (171063502).

161816690 is a wasteful number, since it uses less digits than its factorization.

161816690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311681.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 161816690 is about 12720.7189262243. The cubic root of 161816690 is about 544.9304851999.

The spelling of 161816690 in words is "one hundred sixty-one million, eight hundred sixteen thousand, six hundred ninety".