164440634 has 4 divisors (see below), whose sum is σ = 246660954. Its totient is φ = 82220316.

The previous prime is 164440631. The next prime is 164440637. The reversal of 164440634 is 436044461.

164440634 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, and also an emirpimes, since its reverse is a distinct semiprime: 436044461 = 1301 ⋅335161.

It is an interprime number because it is at equal distance from previous prime (164440631) and next prime (164440637).

It can be written as a sum of positive squares in only one way, i.e., 156175009 + 8265625 = 12497^2 + 2875^2 .

It is a super-3 number, since 3×164440634³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 164440634.

It is not an unprimeable number, because it can be changed into a prime (164440631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41110157 + ... + 41110160.

Almost surely, 2^164440634 is an apocalyptic number.

164440634 is a deficient number, since it is larger than the sum of its proper divisors (82220320).

164440634 is an equidigital number, since it uses as much as digits as its factorization.

164440634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82220319.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 164440634 is about 12823.4408019065. The cubic root of 164440634 is about 547.8601526570.

The spelling of 164440634 in words is "one hundred sixty-four million, four hundred forty thousand, six hundred thirty-four".