646164201 has 4 divisors (see below), whose sum is σ = 861552272. Its totient is φ = 430776132.

The previous prime is 646164191. The next prime is 646164209. The reversal of 646164201 is 102461646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 646164201 - 2²⁵ = 612609769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646164209) 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, 107694031 + ... + 107694036.

It is an arithmetic number, because the mean of its divisors is an integer number (215388068).

Almost surely, 2^646164201 is an apocalyptic number.

It is an amenable number.

646164201 is a deficient number, since it is larger than the sum of its proper divisors (215388071).

646164201 is a wasteful number, since it uses less digits than its factorization.

646164201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215388070.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 646164201 is about 25419.7600500083. The cubic root of 646164201 is about 864.5317839823.

The spelling of 646164201 in words is "six hundred forty-six million, one hundred sixty-four thousand, two hundred one".