164256815 has 8 divisors (see below), whose sum is σ = 197177328. Its totient is φ = 131359360.

The previous prime is 164256811. The next prime is 164256857. The reversal of 164256815 is 518652461.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 164256815 - 2² = 164256811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164256811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22679 + ... + 29031.

It is an arithmetic number, because the mean of its divisors is an integer number (24647166).

Almost surely, 2^164256815 is an apocalyptic number.

164256815 is a deficient number, since it is larger than the sum of its proper divisors (32920513).

164256815 is an equidigital number, since it uses as much as digits as its factorization.

164256815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11529.

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

The square root of 164256815 is about 12816.2714936911. The cubic root of 164256815 is about 547.6559357892.

The spelling of 164256815 in words is "one hundred sixty-four million, two hundred fifty-six thousand, eight hundred fifteen".