815646113551 has 2 divisors, whose sum is σ = 815646113552. Its totient is φ = 815646113550.

The previous prime is 815646113467. The next prime is 815646113591. The reversal of 815646113551 is 155311646518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 815646113551 - 2⁹ = 815646113039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815646113591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407823056775 + 407823056776.

It is an arithmetic number, because the mean of its divisors is an integer number (407823056776).

Almost surely, 2^815646113551 is an apocalyptic number.

815646113551 is a deficient number, since it is larger than the sum of its proper divisors (1).

815646113551 is an equidigital number, since it uses as much as digits as its factorization.

815646113551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432000, while the sum is 46.

The spelling of 815646113551 in words is "eight hundred fifteen billion, six hundred forty-six million, one hundred thirteen thousand, five hundred fifty-one".