66866410 has 16 divisors (see below), whose sum is σ = 129618216. Its totient is φ = 24689088.

The previous prime is 66866399. The next prime is 66866413. The reversal of 66866410 is 1466866.

It can be written as a sum of positive squares in 4 ways, for example, as 56836521 + 10029889 = 7539^2 + 3167^2 .

It is a super-2 number, since 2×66866410² = 8942233572576200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66866410.

It is not an unprimeable number, because it can be changed into a prime (66866413) 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, 257049 + ... + 257308.

Almost surely, 2^66866410 is an apocalyptic number.

66866410 is a deficient number, since it is larger than the sum of its proper divisors (62751806).

66866410 is a wasteful number, since it uses less digits than its factorization.

66866410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514377.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 66866410 is about 8177.1883921064. The cubic root of 66866410 is about 405.8846890369.

It can be divided in two parts, 66866 and 410, that added together give a palindrome (67276).

The spelling of 66866410 in words is "sixty-six million, eight hundred sixty-six thousand, four hundred ten".