66895855 has 8 divisors (see below), whose sum is σ = 86450112. Its totient is φ = 49399968.

The previous prime is 66895841. The next prime is 66895859. The reversal of 66895855 is 55859866.

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 66895855 - 2¹³ = 66887663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66895859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514519 + ... + 514648.

It is an arithmetic number, because the mean of its divisors is an integer number (10806264).

Almost surely, 2^66895855 is an apocalyptic number.

66895855 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66895855 is a deficient number, since it is larger than the sum of its proper divisors (19554257).

66895855 is a wasteful number, since it uses less digits than its factorization.

66895855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029185.

The product of its digits is 2592000, while the sum is 52.

The square root of 66895855 is about 8178.9886294089. The cubic root of 66895855 is about 405.9442581630.

It can be divided in two parts, 6689 and 5855, that added together give a square (12544 = 112²).

The spelling of 66895855 in words is "sixty-six million, eight hundred ninety-five thousand, eight hundred fifty-five".