866155314232451 has 4 divisors (see below), whose sum is σ = 867075776841504. Its totient is φ = 865234851623400.

The previous prime is 866155314232441. The next prime is 866155314232489. The reversal of 866155314232451 is 154232413551668.

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

It is a cyclic number.

It is not a de Polignac number, because 866155314232451 - 2¹⁸ = 866155313970307 is a prime.

It is a super-2 number, since 2×866155314232451² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866155314232441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460231303115 + ... + 460231304996.

It is an arithmetic number, because the mean of its divisors is an integer number (216768944210376).

Almost surely, 2^{866155314232451} is an apocalyptic number.

866155314232451 is a deficient number, since it is larger than the sum of its proper divisors (920462609053).

866155314232451 is an equidigital number, since it uses as much as digits as its factorization.

866155314232451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920462609052.

The product of its digits is 20736000, while the sum is 56.

The spelling of 866155314232451 in words is "eight hundred sixty-six trillion, one hundred fifty-five billion, three hundred fourteen million, two hundred thirty-two thousand, four hundred fifty-one".