668248922450 has 54 divisors (see below), whose sum is σ = 1251505802799. Its totient is φ = 265470666240.

The previous prime is 668248922449. The next prime is 668248922489. The reversal of 668248922450 is 54229842866.

It can be written as a sum of positive squares in 5 ways, for example, as 88627076209 + 579621846241 = 297703^2 + 761329^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=578035.

It is a super-2 number, since 2×668248922450² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1115607251 + ... + 1115607849.

Almost surely, 2^668248922450 is an apocalyptic number.

668248922450 is a deficient number, since it is larger than the sum of its proper divisors (583256880349).

668248922450 is an frugal number, since it uses more digits than its factorization.

668248922450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596 (or 799 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 56.

The spelling of 668248922450 in words is "six hundred sixty-eight billion, two hundred forty-eight million, nine hundred twenty-two thousand, four hundred fifty".