664120071 has 6 divisors (see below), whose sum is σ = 959284560. Its totient is φ = 442746708.

The previous prime is 664120063. The next prime is 664120073. The reversal of 664120071 is 170021466.

It is not a de Polignac number, because 664120071 - 2³ = 664120063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664120073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36895551 + ... + 36895568.

It is an arithmetic number, because the mean of its divisors is an integer number (159880760).

Almost surely, 2^664120071 is an apocalyptic number.

664120071 is a deficient number, since it is larger than the sum of its proper divisors (295164489).

664120071 is a wasteful number, since it uses less digits than its factorization.

664120071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73791125 (or 73791122 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 664120071 is about 25770.5271773784. The cubic root of 664120071 is about 872.4667172850.

The spelling of 664120071 in words is "six hundred sixty-four million, one hundred twenty thousand, seventy-one".