7861804739869 has 2 divisors, whose sum is σ = 7861804739870. Its totient is φ = 7861804739868.

The previous prime is 7861804739837. The next prime is 7861804739923. The reversal of 7861804739869 is 9689374081687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7248010837369 + 613793902500 = 2692213^2 + 783450^2 .

It is an emirp because it is prime and its reverse (9689374081687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7861804739869 - 2⁵ = 7861804739837 is a prime.

It is a super-2 number, since 2×7861804739869² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7861804739795 and 7861804739804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7861844739869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3930902369934 + 3930902369935.

It is an arithmetic number, because the mean of its divisors is an integer number (3930902369935).

Almost surely, 2^{7861804739869} is an apocalyptic number.

It is an amenable number.

7861804739869 is a deficient number, since it is larger than the sum of its proper divisors (1).

7861804739869 is an equidigital number, since it uses as much as digits as its factorization.

7861804739869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 877879296, while the sum is 76.

The spelling of 7861804739869 in words is "seven trillion, eight hundred sixty-one billion, eight hundred four million, seven hundred thirty-nine thousand, eight hundred sixty-nine".