66755655 has 48 divisors (see below), whose sum is σ = 119429856. Its totient is φ = 34479360.

The previous prime is 66755641. The next prime is 66755669. The reversal of 66755655 is 55655766.

It is an interprime number because it is at equal distance from previous prime (66755641) and next prime (66755669).

It is not a de Polignac number, because 66755655 - 2⁷ = 66755527 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 66755655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 227689 + ... + 227981.

It is an arithmetic number, because the mean of its divisors is an integer number (2488122).

Almost surely, 2^66755655 is an apocalyptic number.

66755655 is a deficient number, since it is larger than the sum of its proper divisors (52674201).

66755655 is a wasteful number, since it uses less digits than its factorization.

66755655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448 (or 445 counting only the distinct ones).

The product of its digits is 945000, while the sum is 45.

The square root of 66755655 is about 8170.4133922342. The cubic root of 66755655 is about 405.6604678297.

The spelling of 66755655 in words is "sixty-six million, seven hundred fifty-five thousand, six hundred fifty-five".