865478291101 has 4 divisors (see below), whose sum is σ = 865480155100. Its totient is φ = 865476427104.

The previous prime is 865478291099. The next prime is 865478291107. The reversal of 865478291101 is 101192874568.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 125489520025 + 739988771076 = 354245^2 + 860226^2 .

It is a cyclic number.

It is not a de Polignac number, because 865478291101 - 2¹ = 865478291099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865478291107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381895 + ... + 1369963.

It is an arithmetic number, because the mean of its divisors is an integer number (216370038775).

Almost surely, 2^865478291101 is an apocalyptic number.

It is an amenable number.

865478291101 is a deficient number, since it is larger than the sum of its proper divisors (1863999).

865478291101 is an equidigital number, since it uses as much as digits as its factorization.

865478291101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863998.

The product of its (nonzero) digits is 967680, while the sum is 52.

The spelling of 865478291101 in words is "eight hundred sixty-five billion, four hundred seventy-eight million, two hundred ninety-one thousand, one hundred one".