66553763 has 4 divisors (see below), whose sum is σ = 66632280. Its totient is φ = 66475248.

The previous prime is 66553757. The next prime is 66553769. The reversal of 66553763 is 36735566.

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

It is an interprime number because it is at equal distance from previous prime (66553757) and next prime (66553769).

It is a cyclic number.

It is not a de Polignac number, because 66553763 - 2⁸ = 66553507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66553763.

It is not an unprimeable number, because it can be changed into a prime (66553769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37973 + ... + 39686.

It is an arithmetic number, because the mean of its divisors is an integer number (16658070).

Almost surely, 2^66553763 is an apocalyptic number.

66553763 is a deficient number, since it is larger than the sum of its proper divisors (78517).

66553763 is an equidigital number, since it uses as much as digits as its factorization.

66553763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78516.

The product of its digits is 340200, while the sum is 41.

The square root of 66553763 is about 8158.0489701889. The cubic root of 66553763 is about 405.2511027288.

The spelling of 66553763 in words is "sixty-six million, five hundred fifty-three thousand, seven hundred sixty-three".