866250242442155 has 4 divisors (see below), whose sum is σ = 1039500290930592. Its totient is φ = 693000193953720.

The previous prime is 866250242442133. The next prime is 866250242442341. The reversal of 866250242442155 is 551244242052668.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 866250242442155 - 2¹² = 866250242438059 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 866250242442155.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86625024244211 + ... + 86625024244220.

It is an arithmetic number, because the mean of its divisors is an integer number (259875072732648).

Almost surely, 2^{866250242442155} is an apocalyptic number.

866250242442155 is a deficient number, since it is larger than the sum of its proper divisors (173250048488437).

866250242442155 is a wasteful number, since it uses less digits than its factorization.

866250242442155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173250048488436.

The product of its (nonzero) digits is 36864000, while the sum is 56.

The spelling of 866250242442155 in words is "eight hundred sixty-six trillion, two hundred fifty billion, two hundred forty-two million, four hundred forty-two thousand, one hundred fifty-five".