66353885 has 16 divisors (see below), whose sum is σ = 88709040. Its totient is φ = 47308800.

The previous prime is 66353863. The next prime is 66353887. The reversal of 66353885 is 58835366.

It can be written as a sum of positive squares in 8 ways, for example, as 3024121 + 63329764 = 1739^2 + 7958^2 .

It is not a de Polignac number, because 66353885 - 2⁶ = 66353821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66353887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15716 + ... + 19485.

It is an arithmetic number, because the mean of its divisors is an integer number (5544315).

Almost surely, 2^66353885 is an apocalyptic number.

66353885 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66353885 is a deficient number, since it is larger than the sum of its proper divisors (22355155).

66353885 is a wasteful number, since it uses less digits than its factorization.

66353885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35248.

The product of its digits is 518400, while the sum is 44.

The square root of 66353885 is about 8145.7894031211. The cubic root of 66353885 is about 404.8450049590.

The spelling of 66353885 in words is "sixty-six million, three hundred fifty-three thousand, eight hundred eighty-five".