158216645 has 4 divisors (see below), whose sum is σ = 189859980. Its totient is φ = 126573312.

The previous prime is 158216627. The next prime is 158216647. The reversal of 158216645 is 546612851.

It is a happy number.

158216645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 125395204 + 32821441 = 11198^2 + 5729^2 .

It is a cyclic number.

It is not a de Polignac number, because 158216645 - 2⁸ = 158216389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 158216599 and 158216608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158216647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15821660 + ... + 15821669.

It is an arithmetic number, because the mean of its divisors is an integer number (47464995).

Almost surely, 2^158216645 is an apocalyptic number.

It is an amenable number.

158216645 is a deficient number, since it is larger than the sum of its proper divisors (31643335).

158216645 is an equidigital number, since it uses as much as digits as its factorization.

158216645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31643334.

The product of its digits is 57600, while the sum is 38.

The square root of 158216645 is about 12578.4198133152. The cubic root of 158216645 is about 540.8589952129.

The spelling of 158216645 in words is "one hundred fifty-eight million, two hundred sixteen thousand, six hundred forty-five".