66667755 has 64 divisors (see below), whose sum is σ = 134120448. Its totient is φ = 27471360.

The previous prime is 66667753. The next prime is 66667787. The reversal of 66667755 is 55776666.

It is not a de Polignac number, because 66667755 - 2¹ = 66667753 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66667753) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 227389 + ... + 227681.

It is an arithmetic number, because the mean of its divisors is an integer number (2095632).

Almost surely, 2^66667755 is an apocalyptic number.

66667755 is an abundant number, since it is smaller than the sum of its proper divisors (67452693).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66667755 is a wasteful number, since it uses less digits than its factorization.

66667755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516.

The product of its digits is 1587600, while the sum is 48.

The square root of 66667755 is about 8165.0324555387. The cubic root of 66667755 is about 405.4823395139.

The spelling of 66667755 in words is "sixty-six million, six hundred sixty-seven thousand, seven hundred fifty-five".