158663506 has 4 divisors (see below), whose sum is σ = 237995262. Its totient is φ = 79331752.

The previous prime is 158663489. The next prime is 158663539. The reversal of 158663506 is 605366851.

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

It can be written as a sum of positive squares in only one way, i.e., 93296281 + 65367225 = 9659^2 + 8085^2 .

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 an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39665875 + ... + 39665878.

Almost surely, 2^158663506 is an apocalyptic number.

158663506 is a deficient number, since it is larger than the sum of its proper divisors (79331756).

158663506 is an equidigital number, since it uses as much as digits as its factorization.

158663506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79331755.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 158663506 is about 12596.1702910051. The cubic root of 158663506 is about 541.3677103547.

The spelling of 158663506 in words is "one hundred fifty-eight million, six hundred sixty-three thousand, five hundred six".