664646142 has 16 divisors (see below), whose sum is σ = 1330207632. Its totient is φ = 221396160.

The previous prime is 664646137. The next prime is 664646149. The reversal of 664646142 is 241646466.

It is a self number, because there is not a number n which added to its sum of digits gives 664646142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664646149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28513 + ... + 46284.

It is an arithmetic number, because the mean of its divisors is an integer number (83137977).

Almost surely, 2^664646142 is an apocalyptic number.

664646142 is an abundant number, since it is smaller than the sum of its proper divisors (665561490).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664646142 is a wasteful number, since it uses less digits than its factorization.

664646142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76283.

The product of its digits is 165888, while the sum is 39.

The square root of 664646142 is about 25780.7319911596. The cubic root of 664646142 is about 872.6970261909.

The spelling of 664646142 in words is "six hundred sixty-four million, six hundred forty-six thousand, one hundred forty-two".