145225661 has 12 divisors (see below), whose sum is σ = 170839260. Its totient is φ = 123076800.

The previous prime is 145225651. The next prime is 145225667. The reversal of 145225661 is 166522541.

It can be written as a sum of positive squares in 2 ways, for example, as 61136761 + 84088900 = 7819^2 + 9170^2 .

It is a de Polignac number, because none of the positive numbers 2^k-145225661 is a prime.

It is a super-2 number, since 2×145225661² = 42180985225773842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145225667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12290 + ... + 21011.

It is an arithmetic number, because the mean of its divisors is an integer number (14236605).

Almost surely, 2^145225661 is an apocalyptic number.

It is an amenable number.

145225661 is a deficient number, since it is larger than the sum of its proper divisors (25613599).

145225661 is an equidigital number, since it uses as much as digits as its factorization.

145225661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33404 (or 33397 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 145225661 is about 12050.9609990241. The cubic root of 145225661 is about 525.6311815981.

The spelling of 145225661 in words is "one hundred forty-five million, two hundred twenty-five thousand, six hundred sixty-one".