664436127 has 4 divisors (see below), whose sum is σ = 885914840. Its totient is φ = 442957416.

The previous prime is 664436107. The next prime is 664436159. The reversal of 664436127 is 721634466.

It is a happy number.

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

It is not a de Polignac number, because 664436127 - 2⁶ = 664436063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664436107) 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, 110739352 + ... + 110739357.

It is an arithmetic number, because the mean of its divisors is an integer number (221478710).

Almost surely, 2^664436127 is an apocalyptic number.

664436127 is a deficient number, since it is larger than the sum of its proper divisors (221478713).

664436127 is a wasteful number, since it uses less digits than its factorization.

664436127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221478712.

The product of its digits is 145152, while the sum is 39.

The square root of 664436127 is about 25776.6585693336. The cubic root of 664436127 is about 872.6050981900.

The spelling of 664436127 in words is "six hundred sixty-four million, four hundred thirty-six thousand, one hundred twenty-seven".