866156155417381 has 4 divisors (see below), whose sum is σ = 911743321492000. Its totient is φ = 820568989342764.

The previous prime is 866156155417369. The next prime is 866156155417417. The reversal of 866156155417381 is 183714551651668.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 866156155417381 - 2⁹ = 866156155416869 is a prime.

It is a super-2 number, since 2×866156155417381² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866156155417361) 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, 22793583037281 + ... + 22793583037318.

It is an arithmetic number, because the mean of its divisors is an integer number (227935830373000).

Almost surely, 2^{866156155417381} is an apocalyptic number.

It is an amenable number.

866156155417381 is a deficient number, since it is larger than the sum of its proper divisors (45587166074619).

866156155417381 is a wasteful number, since it uses less digits than its factorization.

866156155417381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45587166074618.

The product of its digits is 145152000, while the sum is 67.

The spelling of 866156155417381 in words is "eight hundred sixty-six trillion, one hundred fifty-six billion, one hundred fifty-five million, four hundred seventeen thousand, three hundred eighty-one".