145668415 has 4 divisors (see below), whose sum is σ = 174802104. Its totient is φ = 116534728.

The previous prime is 145668389. The next prime is 145668437. The reversal of 145668415 is 514866541.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 145668415 - 2¹⁵ = 145635647 is a prime.

It is a super-2 number, since 2×145668415² = 42438574257224450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14566837 + ... + 14566846.

It is an arithmetic number, because the mean of its divisors is an integer number (43700526).

Almost surely, 2^145668415 is an apocalyptic number.

145668415 is a deficient number, since it is larger than the sum of its proper divisors (29133689).

145668415 is an equidigital number, since it uses as much as digits as its factorization.

145668415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29133688.

The product of its digits is 115200, while the sum is 40.

The square root of 145668415 is about 12069.3170892143. The cubic root of 145668415 is about 526.1648090593.

The spelling of 145668415 in words is "one hundred forty-five million, six hundred sixty-eight thousand, four hundred fifteen".