866651115501 has 16 divisors (see below), whose sum is σ = 1284186268800. Its totient is φ = 577650999744.

The previous prime is 866651115481. The next prime is 866651115503. The reversal of 866651115501 is 105511156668.

It is not a de Polignac number, because 866651115501 - 2¹⁰ = 866651114477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866651115503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3097036 + ... + 3365253.

It is an arithmetic number, because the mean of its divisors is an integer number (80261641800).

Almost surely, 2^866651115501 is an apocalyptic number.

It is an amenable number.

866651115501 is a deficient number, since it is larger than the sum of its proper divisors (417535153299).

866651115501 is a wasteful number, since it uses less digits than its factorization.

866651115501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6467265 (or 6467259 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 45.

The spelling of 866651115501 in words is "eight hundred sixty-six billion, six hundred fifty-one million, one hundred fifteen thousand, five hundred one".