86621863849 has 2 divisors, whose sum is σ = 86621863850. Its totient is φ = 86621863848.

The previous prime is 86621863843. The next prime is 86621863877. The reversal of 86621863849 is 94836812668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44549700624 + 42072163225 = 211068^2 + 205115^2 .

It is a cyclic number.

It is not a de Polignac number, because 86621863849 - 2¹¹ = 86621861801 is a prime.

It is not a weakly prime, because it can be changed into another prime (86621863843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43310931924 + 43310931925.

It is an arithmetic number, because the mean of its divisors is an integer number (43310931925).

Almost surely, 2^86621863849 is an apocalyptic number.

It is an amenable number.

86621863849 is a deficient number, since it is larger than the sum of its proper divisors (1).

86621863849 is an equidigital number, since it uses as much as digits as its factorization.

86621863849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23887872, while the sum is 61.

The spelling of 86621863849 in words is "eighty-six billion, six hundred twenty-one million, eight hundred sixty-three thousand, eight hundred forty-nine".