664867981742 has 8 divisors (see below), whose sum is σ = 1040662928016. Its totient is φ = 317980339072.

The previous prime is 664867981697. The next prime is 664867981759. The reversal of 664867981742 is 247189768466.

664867981742 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×664867981742³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7226825843 + ... + 7226825934.

It is an arithmetic number, because the mean of its divisors is an integer number (130082866002).

Almost surely, 2^664867981742 is an apocalyptic number.

664867981742 is a deficient number, since it is larger than the sum of its proper divisors (375794946274).

664867981742 is a wasteful number, since it uses less digits than its factorization.

664867981742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14453651802.

The product of its digits is 195084288, while the sum is 68.

The spelling of 664867981742 in words is "six hundred sixty-four billion, eight hundred sixty-seven million, nine hundred eighty-one thousand, seven hundred forty-two".