161606000000025 has 72 divisors (see below), whose sum is σ = 336227948448704. Its totient is φ = 72665929699200.

The previous prime is 161606000000009. The next prime is 161606000000033. The reversal of 161606000000025 is 520000000606161.

It is a happy number.

161606000000025 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161606000000025 - 2⁴ = 161606000000009 is a prime.

It is a super-2 number, since 2×161606000000025² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 840944779 + ... + 841136928.

Almost surely, 2^{161606000000025} is an apocalyptic number.

161606000000025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161606000000025 is an abundant number, since it is smaller than the sum of its proper divisors (174621948448679).

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

161606000000025 is a wasteful number, since it uses less digits than its factorization.

161606000000025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682081791 (or 1682081783 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

Adding to 161606000000025 its reverse (520000000606161), we get a palindrome (681606000606186).

The spelling of 161606000000025 in words is "one hundred sixty-one trillion, six hundred six billion, twenty-five", and thus it is an aban number.