815478016211 has 2 divisors, whose sum is σ = 815478016212. Its totient is φ = 815478016210.

The previous prime is 815478016159. The next prime is 815478016219. The reversal of 815478016211 is 112610874518.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-815478016211 is a prime.

It is not a weakly prime, because it can be changed into another prime (815478016219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407739008105 + 407739008106.

It is an arithmetic number, because the mean of its divisors is an integer number (407739008106).

Almost surely, 2^815478016211 is an apocalyptic number.

815478016211 is a deficient number, since it is larger than the sum of its proper divisors (1).

815478016211 is an equidigital number, since it uses as much as digits as its factorization.

815478016211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 44.

The spelling of 815478016211 in words is "eight hundred fifteen billion, four hundred seventy-eight million, sixteen thousand, two hundred eleven".