66861130 has 64 divisors (see below), whose sum is σ = 142813440. Its totient is φ = 22063104.

The previous prime is 66861121. The next prime is 66861131. The reversal of 66861130 is 3116866.

It is a junction number, because it is equal to n+sod(n) for n = 66861092 and 66861101.

It is not an unprimeable number, because it can be changed into a prime (66861131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 291856 + ... + 292084.

It is an arithmetic number, because the mean of its divisors is an integer number (2231460).

Almost surely, 2^66861130 is an apocalyptic number.

66861130 is an abundant number, since it is smaller than the sum of its proper divisors (75952310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66861130 is a wasteful number, since it uses less digits than its factorization.

66861130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 66861130 is about 8176.8655363776. The cubic root of 66861130 is about 405.8740054088.

Adding to 66861130 its reverse (3116866), we get a palindrome (69977996).

The spelling of 66861130 in words is "sixty-six million, eight hundred sixty-one thousand, one hundred thirty".