668933846949 has 8 divisors (see below), whose sum is σ = 892083041920. Its totient is φ = 445870274976.

The previous prime is 668933846947. The next prime is 668933846953. The reversal of 668933846949 is 949648339866.

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

It is not a de Polignac number, because 668933846949 - 2¹ = 668933846947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668933846947) 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, 21387517 + ... + 21418770.

It is an arithmetic number, because the mean of its divisors is an integer number (111510380240).

Almost surely, 2^668933846949 is an apocalyptic number.

It is an amenable number.

668933846949 is a deficient number, since it is larger than the sum of its proper divisors (223149194971).

668933846949 is a wasteful number, since it uses less digits than its factorization.

668933846949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42811499.

The product of its digits is 1451188224, while the sum is 75.

The spelling of 668933846949 in words is "six hundred sixty-eight billion, nine hundred thirty-three million, eight hundred forty-six thousand, nine hundred forty-nine".