161622650 has 48 divisors (see below), whose sum is σ = 345793344. Its totient is φ = 55054080.

The previous prime is 161622641. The next prime is 161622677. The reversal of 161622650 is 56226161.

It is a super-2 number, since 2×161622650² = 52243761986045000, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55634 + ... + 58466.

It is an arithmetic number, because the mean of its divisors is an integer number (7204028).

Almost surely, 2^161622650 is an apocalyptic number.

161622650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161622650 is an abundant number, since it is smaller than the sum of its proper divisors (184170694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161622650 is a wasteful number, since it uses less digits than its factorization.

161622650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3015 (or 3010 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 161622650 is about 12713.0897110026. The cubic root of 161622650 is about 544.7125830697.

The spelling of 161622650 in words is "one hundred sixty-one million, six hundred twenty-two thousand, six hundred fifty".