66553371 has 24 divisors (see below), whose sum is σ = 101999040. Its totient is φ = 41698800.

The previous prime is 66553369. The next prime is 66553381. The reversal of 66553371 is 17335566.

It is a happy number.

It is not a de Polignac number, because 66553371 - 2¹ = 66553369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66553321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20916 + ... + 23886.

It is an arithmetic number, because the mean of its divisors is an integer number (4249960).

Almost surely, 2^66553371 is an apocalyptic number.

66553371 is a deficient number, since it is larger than the sum of its proper divisors (35445669).

66553371 is a wasteful number, since it uses less digits than its factorization.

66553371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3127 (or 3124 counting only the distinct ones).

The product of its digits is 56700, while the sum is 36.

The square root of 66553371 is about 8158.0249448013. The cubic root of 66553371 is about 405.2503070876.

The spelling of 66553371 in words is "sixty-six million, five hundred fifty-three thousand, three hundred seventy-one".