164421856 has 12 divisors (see below), whose sum is σ = 323705592. Its totient is φ = 82210912.

The previous prime is 164421853. The next prime is 164421857. The reversal of 164421856 is 658124461.

It is a super-3 number, since 3×164421856³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164421853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2569060 + ... + 2569123.

It is an arithmetic number, because the mean of its divisors is an integer number (26975466).

Almost surely, 2^164421856 is an apocalyptic number.

164421856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

164421856 is a deficient number, since it is larger than the sum of its proper divisors (159283736).

164421856 is an equidigital number, since it uses as much as digits as its factorization.

164421856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5138193 (or 5138185 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 164421856 is about 12822.7086062189. The cubic root of 164421856 is about 547.8392978977.

The spelling of 164421856 in words is "one hundred sixty-four million, four hundred twenty-one thousand, eight hundred fifty-six".