164612505 has 16 divisors (see below), whose sum is σ = 264046464. Its totient is φ = 87571200.

The previous prime is 164612491. The next prime is 164612507. The reversal of 164612505 is 505216461.

It is not a de Polignac number, because 164612505 - 2⁵ = 164612473 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (164612507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7669 + ... + 19698.

It is an arithmetic number, because the mean of its divisors is an integer number (16502904).

Almost surely, 2^164612505 is an apocalyptic number.

164612505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

164612505 is a deficient number, since it is larger than the sum of its proper divisors (99433959).

164612505 is a wasteful number, since it uses less digits than its factorization.

164612505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27776.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 164612505 is about 12830.1404902674. The cubic root of 164612505 is about 548.0509580634.

Adding to 164612505 its reverse (505216461), we get a palindrome (669828966).

The spelling of 164612505 in words is "one hundred sixty-four million, six hundred twelve thousand, five hundred five".