668048077680 has 80 divisors (see below), whose sum is σ = 2073082564224. Its totient is φ = 177962625280.

The previous prime is 668048077663. The next prime is 668048077693. The reversal of 668048077680 is 86770840866.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1200294 + ... + 1666373.

Almost surely, 2^668048077680 is an apocalyptic number.

668048077680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668048077680 is an abundant number, since it is smaller than the sum of its proper divisors (1405034486544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668048077680 is a wasteful number, since it uses less digits than its factorization.

668048077680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2867654 (or 2867648 counting only the distinct ones).

The product of its (nonzero) digits is 21676032, while the sum is 60.

The spelling of 668048077680 in words is "six hundred sixty-eight billion, forty-eight million, seventy-seven thousand, six hundred eighty".