161612025 has 24 divisors (see below), whose sum is σ = 267628704. Its totient is φ = 86054400.

The previous prime is 161611993. The next prime is 161612029. The reversal of 161612025 is 520216161.

It is not a de Polignac number, because 161612025 - 2⁵ = 161611993 is a prime.

It is a super-2 number, since 2×161612025² = 52236893249201250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161611986 and 161612004.

It is not an unprimeable number, because it can be changed into a prime (161612029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59497 + ... + 62153.

It is an arithmetic number, because the mean of its divisors is an integer number (11151196).

Almost surely, 2^161612025 is an apocalyptic number.

161612025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161612025 is a deficient number, since it is larger than the sum of its proper divisors (106016679).

161612025 is a wasteful number, since it uses less digits than its factorization.

161612025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3481 (or 3476 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 161612025 is about 12712.6718277473. The cubic root of 161612025 is about 544.7006464218.

Adding to 161612025 its reverse (520216161), we get a palindrome (681828186).

The spelling of 161612025 in words is "one hundred sixty-one million, six hundred twelve thousand, twenty-five".