664271085 has 16 divisors (see below), whose sum is σ = 1063681920. Its totient is φ = 353995200.

The previous prime is 664271081. The next prime is 664271099. The reversal of 664271085 is 580172466.

It is not a de Polignac number, because 664271085 - 2² = 664271081 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664271081) 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, 2496 + ... + 36534.

It is an arithmetic number, because the mean of its divisors is an integer number (66480120).

Almost surely, 2^664271085 is an apocalyptic number.

It is an amenable number.

664271085 is a deficient number, since it is larger than the sum of its proper divisors (399410835).

664271085 is a wasteful number, since it uses less digits than its factorization.

664271085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35348.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 664271085 is about 25773.4569858217. The cubic root of 664271085 is about 872.5328422270.

The spelling of 664271085 in words is "six hundred sixty-four million, two hundred seventy-one thousand, eighty-five".