161650425 has 24 divisors (see below), whose sum is σ = 268777440. Its totient is φ = 85724800.

The previous prime is 161650421. The next prime is 161650453. The reversal of 161650425 is 524056161.

It is not a de Polignac number, because 161650425 - 2² = 161650421 is a prime.

It is a super-2 number, since 2×161650425² = 52261719805361250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161650392 and 161650401.

It is not an unprimeable number, because it can be changed into a prime (161650421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7405 + ... + 19445.

It is an arithmetic number, because the mean of its divisors is an integer number (11199060).

Almost surely, 2^161650425 is an apocalyptic number.

161650425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161650425 is a deficient number, since it is larger than the sum of its proper divisors (107127015).

161650425 is a wasteful number, since it uses less digits than its factorization.

161650425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12233 (or 12228 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 161650425 is about 12714.1820421134. The cubic root of 161650425 is about 544.7437844008.

The spelling of 161650425 in words is "one hundred sixty-one million, six hundred fifty thousand, four hundred twenty-five".