863566861381 has 8 divisors (see below), whose sum is σ = 987185548800. Its totient is φ = 740011172208.

The previous prime is 863566861363. The next prime is 863566861403. The reversal of 863566861381 is 183168665368.

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

It is not a de Polignac number, because 863566861381 - 2²⁵ = 863533306949 is a prime.

It is a super-2 number, since 2×863566861381² (a number of 25 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 (863566861301) 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, 15720181 + ... + 15775018.

It is an arithmetic number, because the mean of its divisors is an integer number (123398193600).

Almost surely, 2^863566861381 is an apocalyptic number.

It is an amenable number.

863566861381 is a deficient number, since it is larger than the sum of its proper divisors (123618687419).

863566861381 is a wasteful number, since it uses less digits than its factorization.

863566861381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31499123.

The product of its digits is 29859840, while the sum is 61.

The spelling of 863566861381 in words is "eight hundred sixty-three billion, five hundred sixty-six million, eight hundred sixty-one thousand, three hundred eighty-one".