161725388 has 48 divisors (see below), whose sum is σ = 321377280. Its totient is φ = 70545600.

The previous prime is 161725387. The next prime is 161725391. The reversal of 161725388 is 883527161.

It is a super-2 number, since 2×161725388² = 52310202247501088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161725387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189170 + ... + 190022.

It is an arithmetic number, because the mean of its divisors is an integer number (6695360).

Almost surely, 2^161725388 is an apocalyptic number.

It is an amenable number.

161725388 is a deficient number, since it is larger than the sum of its proper divisors (159651892).

161725388 is a wasteful number, since it uses less digits than its factorization.

161725388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038 (or 1036 counting only the distinct ones).

The product of its digits is 80640, while the sum is 41.

The square root of 161725388 is about 12717.1297076030. The cubic root of 161725388 is about 544.8279770191.

The spelling of 161725388 in words is "one hundred sixty-one million, seven hundred twenty-five thousand, three hundred eighty-eight".