664887709142 has 4 divisors (see below), whose sum is σ = 997331563716. Its totient is φ = 332443854570.

The previous prime is 664887709139. The next prime is 664887709147. The reversal of 664887709142 is 241907788466.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664887709147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166221927284 + ... + 166221927287.

It is an arithmetic number, because the mean of its divisors is an integer number (249332890929).

Almost surely, 2^664887709142 is an apocalyptic number.

664887709142 is a deficient number, since it is larger than the sum of its proper divisors (332443854574).

664887709142 is a wasteful number, since it uses less digits than its factorization.

664887709142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332443854573.

The product of its (nonzero) digits is 32514048, while the sum is 62.

The spelling of 664887709142 in words is "six hundred sixty-four billion, eight hundred eighty-seven million, seven hundred nine thousand, one hundred forty-two".