815673376409 has 2 divisors, whose sum is σ = 815673376410. Its totient is φ = 815673376408.

The previous prime is 815673376403. The next prime is 815673376411. The reversal of 815673376409 is 904673376518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 550445286400 + 265228090009 = 741920^2 + 515003^2 .

It is a cyclic number.

It is not a de Polignac number, because 815673376409 - 2¹² = 815673372313 is a prime.

Together with 815673376411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (815673376403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407836688204 + 407836688205.

It is an arithmetic number, because the mean of its divisors is an integer number (407836688205).

Almost surely, 2^815673376409 is an apocalyptic number.

It is an amenable number.

815673376409 is a deficient number, since it is larger than the sum of its proper divisors (1).

815673376409 is an equidigital number, since it uses as much as digits as its factorization.

815673376409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22861440, while the sum is 59.

The spelling of 815673376409 in words is "eight hundred fifteen billion, six hundred seventy-three million, three hundred seventy-six thousand, four hundred nine".