866309220015 has 8 divisors (see below), whose sum is σ = 1386094752048. Its totient is φ = 462031584000.

The previous prime is 866309220013. The next prime is 866309220043. The reversal of 866309220015 is 510022903668.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 866309220015 - 2¹ = 866309220013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866309220013) 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, 28876973986 + ... + 28876974015.

It is an arithmetic number, because the mean of its divisors is an integer number (173261844006).

Almost surely, 2^866309220015 is an apocalyptic number.

866309220015 is a deficient number, since it is larger than the sum of its proper divisors (519785532033).

866309220015 is a wasteful number, since it uses less digits than its factorization.

866309220015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57753948009.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 866309220015 in words is "eight hundred sixty-six billion, three hundred nine million, two hundred twenty thousand, fifteen".