668248877 has 4 divisors (see below), whose sum is σ = 697303200. Its totient is φ = 639194556.

The previous prime is 668248871. The next prime is 668248883. The reversal of 668248877 is 778842866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 778842866 = 2 ⋅389421433.

It is an interprime number because it is at equal distance from previous prime (668248871) and next prime (668248883).

It is a cyclic number.

It is not a de Polignac number, because 668248877 - 2⁶ = 668248813 is a prime.

It is a super-3 number, since 3×668248877³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668248871) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 14527127 + ... + 14527172.

It is an arithmetic number, because the mean of its divisors is an integer number (174325800).

Almost surely, 2^668248877 is an apocalyptic number.

It is an amenable number.

668248877 is a deficient number, since it is larger than the sum of its proper divisors (29054323).

668248877 is a wasteful number, since it uses less digits than its factorization.

668248877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29054322.

The product of its digits is 7225344, while the sum is 56.

The square root of 668248877 is about 25850.5101883889. The cubic root of 668248877 is about 874.2710127471.

The spelling of 668248877 in words is "six hundred sixty-eight million, two hundred forty-eight thousand, eight hundred seventy-seven".