158778187 has 4 divisors (see below), whose sum is σ = 163900096. Its totient is φ = 153656280.

The previous prime is 158778167. The next prime is 158778203. The reversal of 158778187 is 781877851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 781877851 = 4663 ⋅167677.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158778187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158778167) 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, 2560908 + ... + 2560969.

It is an arithmetic number, because the mean of its divisors is an integer number (40975024).

Almost surely, 2^158778187 is an apocalyptic number.

158778187 is a deficient number, since it is larger than the sum of its proper divisors (5121909).

158778187 is an equidigital number, since it uses as much as digits as its factorization.

158778187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5121908.

The product of its digits is 878080, while the sum is 52.

The square root of 158778187 is about 12600.7216856813. The cubic root of 158778187 is about 541.4981113521.

The spelling of 158778187 in words is "one hundred fifty-eight million, seven hundred seventy-eight thousand, one hundred eighty-seven".