161336025 has 36 divisors (see below), whose sum is σ = 296035740. Its totient is φ = 83942400.

The previous prime is 161336017. The next prime is 161336029. The reversal of 161336025 is 520633161.

It can be written as a sum of positive squares in 6 ways, for example, as 83119689 + 78216336 = 9117^2 + 8844^2 .

It is not a de Polignac number, because 161336025 - 2³ = 161336017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161336025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161336029) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 481 + ... + 17969.

It is an arithmetic number, because the mean of its divisors is an integer number (8223215).

Almost surely, 2^161336025 is an apocalyptic number.

161336025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161336025 is a deficient number, since it is larger than the sum of its proper divisors (134699715).

161336025 is a wasteful number, since it uses less digits than its factorization.

161336025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17546 (or 17538 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 161336025 is about 12701.8118786258. The cubic root of 161336025 is about 544.3903909577.

Adding to 161336025 its reverse (520633161), we get a palindrome (681969186).

The spelling of 161336025 in words is "one hundred sixty-one million, three hundred thirty-six thousand, twenty-five".