667668755 has 8 divisors (see below), whose sum is σ = 862833552. Its totient is φ = 493047648.

The previous prime is 667668733. The next prime is 667668791. The reversal of 667668755 is 557866766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667668755 - 2⁶ = 667668691 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667668755.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5135849 + ... + 5135978.

It is an arithmetic number, because the mean of its divisors is an integer number (107854194).

Almost surely, 2^667668755 is an apocalyptic number.

667668755 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

667668755 is a deficient number, since it is larger than the sum of its proper divisors (195164797).

667668755 is a wasteful number, since it uses less digits than its factorization.

667668755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10271845.

The product of its digits is 12700800, while the sum is 56.

The square root of 667668755 is about 25839.2870451179. The cubic root of 667668755 is about 874.0179480070.

The spelling of 667668755 in words is "six hundred sixty-seven million, six hundred sixty-eight thousand, seven hundred fifty-five".