161415425 has 24 divisors (see below), whose sum is σ = 213435000. Its totient is φ = 120673280.

The previous prime is 161415409. The next prime is 161415427. The reversal of 161415425 is 524514161.

It can be written as a sum of positive squares in 12 ways, for example, as 19114384 + 142301041 = 4372^2 + 11929^2 .

It is not a de Polignac number, because 161415425 - 2⁴ = 161415409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161415427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62051 + ... + 64599.

It is an arithmetic number, because the mean of its divisors is an integer number (8893125).

Almost surely, 2^161415425 is an apocalyptic number.

It is an amenable number.

161415425 is a deficient number, since it is larger than the sum of its proper divisors (52019575).

161415425 is a wasteful number, since it uses less digits than its factorization.

161415425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2725 (or 2720 counting only the distinct ones).

The product of its digits is 4800, while the sum is 29.

The square root of 161415425 is about 12704.9370325083. The cubic root of 161415425 is about 544.4796818401.

Adding to 161415425 its reverse (524514161), we get a palindrome (685929586).

The spelling of 161415425 in words is "one hundred sixty-one million, four hundred fifteen thousand, four hundred twenty-five".