161606320125 has 64 divisors (see below), whose sum is σ = 285169517568. Its totient is φ = 80995200000.

The previous prime is 161606320087. The next prime is 161606320129. The reversal of 161606320125 is 521023606161.

It is not a de Polignac number, because 161606320125 - 2¹² = 161606316029 is a prime.

It is a super-2 number, since 2×161606320125² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161606320129) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4194700 + ... + 4233050.

It is an arithmetic number, because the mean of its divisors is an integer number (4455773712).

Almost surely, 2^161606320125 is an apocalyptic number.

161606320125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161606320125 is a deficient number, since it is larger than the sum of its proper divisors (123563197443).

161606320125 is a wasteful number, since it uses less digits than its factorization.

161606320125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39047 (or 39037 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

Adding to 161606320125 its reverse (521023606161), we get a palindrome (682629926286).

The spelling of 161606320125 in words is "one hundred sixty-one billion, six hundred six million, three hundred twenty thousand, one hundred twenty-five".