866690245444 has 27 divisors (see below), whose sum is σ = 1600801411167. Its totient is φ = 410520727368.

The previous prime is 866690245373. The next prime is 866690245459. The reversal of 866690245444 is 444542096668.

The square root of 866690245444 is 930962.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 35364307 + ... + 35388805.

Almost surely, 2^866690245444 is an apocalyptic number.

866690245444 is the 930962-nd square number.

It is an amenable number.

866690245444 is a deficient number, since it is larger than the sum of its proper divisors (734111165723).

866690245444 is an frugal number, since it uses more digits than its factorization.

866690245444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49040 (or 24520 counting only the distinct ones).

The product of its (nonzero) digits is 39813120, while the sum is 58.

The spelling of 866690245444 in words is "eight hundred sixty-six billion, six hundred ninety million, two hundred forty-five thousand, four hundred forty-four".