668048874655 has 4 divisors (see below), whose sum is σ = 801658649592. Its totient is φ = 534439099720.

The previous prime is 668048874629. The next prime is 668048874739. The reversal of 668048874655 is 556478840866.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 668048874655 - 2³¹ = 665901391007 is a prime.

It is a Duffinian number.

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, 66804887461 + ... + 66804887470.

It is an arithmetic number, because the mean of its divisors is an integer number (200414662398).

Almost surely, 2^668048874655 is an apocalyptic number.

668048874655 is a deficient number, since it is larger than the sum of its proper divisors (133609774937).

668048874655 is a wasteful number, since it uses less digits than its factorization.

668048874655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133609774936.

The product of its (nonzero) digits is 309657600, while the sum is 67.

The spelling of 668048874655 in words is "six hundred sixty-eight billion, forty-eight million, eight hundred seventy-four thousand, six hundred fifty-five".