66533410 has 16 divisors (see below), whose sum is σ = 126805176. Its totient is φ = 25047808.

The previous prime is 66533407. The next prime is 66533413. The reversal of 66533410 is 1433566.

It is an interprime number because it is at equal distance from previous prime (66533407) and next prime (66533413).

It can be written as a sum of positive squares in 4 ways, for example, as 66471409 + 62001 = 8153^2 + 249^2 .

It is not an unprimeable number, because it can be changed into a prime (66533413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195517 + ... + 195856.

Almost surely, 2^66533410 is an apocalyptic number.

66533410 is a deficient number, since it is larger than the sum of its proper divisors (60271766).

66533410 is a wasteful number, since it uses less digits than its factorization.

66533410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391397.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 66533410 is about 8156.8014564534. The cubic root of 66533410 is about 405.2097881772.

Adding to 66533410 its reverse (1433566), we get a palindrome (67966976).

The spelling of 66533410 in words is "sixty-six million, five hundred thirty-three thousand, four hundred ten".