667648885555 has 4 divisors (see below), whose sum is σ = 801178662672. Its totient is φ = 534119108440.

The previous prime is 667648885493. The next prime is 667648885609. The reversal of 667648885555 is 555588846766.

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

It is not a de Polignac number, because 667648885555 - 2¹¹ = 667648883507 is a prime.

It is a Duffinian 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, 66764888551 + ... + 66764888560.

It is an arithmetic number, because the mean of its divisors is an integer number (200294665668).

Almost surely, 2^667648885555 is an apocalyptic number.

667648885555 is a deficient number, since it is larger than the sum of its proper divisors (133529777117).

667648885555 is a wasteful number, since it uses less digits than its factorization.

667648885555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133529777116.

The product of its digits is 1935360000, while the sum is 73.

It can be divided in two parts, 667648 and 885555, that added together give a triangular number (1553203 = T₁₇₆₂).

The spelling of 667648885555 in words is "six hundred sixty-seven billion, six hundred forty-eight million, eight hundred eighty-five thousand, five hundred fifty-five".