668029511752 has 8 divisors (see below), whose sum is σ = 1252555334550. Its totient is φ = 334014755872.

The previous prime is 668029511741. The next prime is 668029511767. The reversal of 668029511752 is 257115920866.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 387962053956 + 280067457796 = 622866^2 + 529214^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×668029511752² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 668029511752.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41751844477 + ... + 41751844492.

Almost surely, 2^668029511752 is an apocalyptic number.

It is an amenable number.

668029511752 is a deficient number, since it is larger than the sum of its proper divisors (584525822798).

668029511752 is a wasteful number, since it uses less digits than its factorization.

668029511752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83503688975 (or 83503688971 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 668029511752 in words is "six hundred sixty-eight billion, twenty-nine million, five hundred eleven thousand, seven hundred fifty-two".