66888755 has 8 divisors (see below), whose sum is σ = 81974592. Its totient is φ = 52372288.

The previous prime is 66888709. The next prime is 66888781. The reversal of 66888755 is 55788866.

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

It is not a de Polignac number, because 66888755 - 2¹⁴ = 66872371 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66888697 and 66888706.

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, 142082 + ... + 142551.

It is an arithmetic number, because the mean of its divisors is an integer number (10246824).

Almost surely, 2^66888755 is an apocalyptic number.

66888755 is a deficient number, since it is larger than the sum of its proper divisors (15085837).

66888755 is a wasteful number, since it uses less digits than its factorization.

66888755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284685.

The product of its digits is 3225600, while the sum is 53.

The square root of 66888755 is about 8178.5545788972. The cubic root of 66888755 is about 405.9298960065.

The spelling of 66888755 in words is "sixty-six million, eight hundred eighty-eight thousand, seven hundred fifty-five".