866111283801 has 27 divisors (see below), whose sum is σ = 1292837085813. Its totient is φ = 558725634360.

The previous prime is 866111283769. The next prime is 866111283833. The reversal of 866111283801 is 108382111668.

The square root of 866111283801 is 930651.

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

866111283801 is a `hidden beast` number, since 8 + 6 + 611 + 1 + 28 + 3 + 8 + 0 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (866111283769) and next prime (866111283833).

It is not a de Polignac number, because 866111283801 - 2⁵ = 866111283769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (866111283881) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 86545540 + ... + 86555546.

Almost surely, 2^866111283801 is an apocalyptic number.

866111283801 is the 930651-st square number.

866111283801 is the 465326-th centered octagonal number.

It is an amenable number.

866111283801 is a deficient number, since it is larger than the sum of its proper divisors (426725802012).

866111283801 is an frugal number, since it uses more digits than its factorization.

866111283801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20082 (or 10041 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The spelling of 866111283801 in words is "eight hundred sixty-six billion, one hundred eleven million, two hundred eighty-three thousand, eight hundred one".