164421543 has 16 divisors (see below), whose sum is σ = 257556096. Its totient is φ = 91983840.

The previous prime is 164421541. The next prime is 164421553. The reversal of 164421543 is 345124461.

It is not a de Polignac number, because 164421543 - 2¹ = 164421541 is a prime.

It is a super-3 number, since 3×164421543³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 164421543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164421541) 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, 191205 + ... + 192062.

It is an arithmetic number, because the mean of its divisors is an integer number (16097256).

Almost surely, 2^164421543 is an apocalyptic number.

164421543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

164421543 is a deficient number, since it is larger than the sum of its proper divisors (93134553).

164421543 is a wasteful number, since it uses less digits than its factorization.

164421543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383294.

The product of its digits is 11520, while the sum is 30.

The square root of 164421543 is about 12822.6964013034. The cubic root of 164421543 is about 547.8389502679.

The spelling of 164421543 in words is "one hundred sixty-four million, four hundred twenty-one thousand, five hundred forty-three".