66501755 has 4 divisors (see below), whose sum is σ = 79802112. Its totient is φ = 53201400.

The previous prime is 66501751. The next prime is 66501769. The reversal of 66501755 is 55710566.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66501755 - 2² = 66501751 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66501751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6650171 + ... + 6650180.

It is an arithmetic number, because the mean of its divisors is an integer number (19950528).

Almost surely, 2^66501755 is an apocalyptic number.

66501755 is a deficient number, since it is larger than the sum of its proper divisors (13300357).

66501755 is a wasteful number, since it uses less digits than its factorization.

66501755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13300356.

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 66501755 is about 8154.8608203942. The cubic root of 66501755 is about 405.1455149515.

The spelling of 66501755 in words is "sixty-six million, five hundred one thousand, seven hundred fifty-five".