164556403 has 4 divisors (see below), whose sum is σ = 179516088. Its totient is φ = 149596720.

The previous prime is 164556391. The next prime is 164556419. The reversal of 164556403 is 304655461.

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 164556403 - 2⁹ = 164555891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164556433) 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, 7479826 + ... + 7479847.

It is an arithmetic number, because the mean of its divisors is an integer number (44879022).

Almost surely, 2^164556403 is an apocalyptic number.

164556403 is a deficient number, since it is larger than the sum of its proper divisors (14959685).

164556403 is a wasteful number, since it uses less digits than its factorization.

164556403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14959684.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 164556403 is about 12827.9539678002. The cubic root of 164556403 is about 547.9886901159.

The spelling of 164556403 in words is "one hundred sixty-four million, five hundred fifty-six thousand, four hundred three".