164425521 has 16 divisors (see below), whose sum is σ = 242481344. Its totient is φ = 98449344.

The previous prime is 164425517. The next prime is 164425531. The reversal of 164425521 is 125524461.

It is not a de Polignac number, because 164425521 - 2² = 164425517 is a prime.

It is a super-3 number, since 3×164425521³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164425501) 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, 55531 + ... + 58416.

It is an arithmetic number, because the mean of its divisors is an integer number (15155084).

Almost surely, 2^164425521 is an apocalyptic number.

It is an amenable number.

164425521 is a deficient number, since it is larger than the sum of its proper divisors (78055823).

164425521 is a wasteful number, since it uses less digits than its factorization.

164425521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114000.

The product of its digits is 9600, while the sum is 30.

The square root of 164425521 is about 12822.8515159461. The cubic root of 164425521 is about 547.8433683543.

Adding to 164425521 its reverse (125524461), we get a palindrome (289949982).

The spelling of 164425521 in words is "one hundred sixty-four million, four hundred twenty-five thousand, five hundred twenty-one".