164406503 has 4 divisors (see below), whose sum is σ = 168849960. Its totient is φ = 159963048.

The previous prime is 164406499. The next prime is 164406511. The reversal of 164406503 is 305604461.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 164406503 - 2² = 164406499 is a prime.

It is a super-3 number, since 3×164406503³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164406523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2221673 + ... + 2221746.

It is an arithmetic number, because the mean of its divisors is an integer number (42212490).

Almost surely, 2^164406503 is an apocalyptic number.

164406503 is a deficient number, since it is larger than the sum of its proper divisors (4443457).

164406503 is an equidigital number, since it uses as much as digits as its factorization.

164406503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4443456.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 164406503 is about 12822.1099277771. The cubic root of 164406503 is about 547.8222457475.

The spelling of 164406503 in words is "one hundred sixty-four million, four hundred six thousand, five hundred three".