815839819603 has 2 divisors, whose sum is σ = 815839819604. Its totient is φ = 815839819602.

The previous prime is 815839819601. The next prime is 815839819609. The reversal of 815839819603 is 306918938518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 815839819603 - 2¹ = 815839819601 is a prime.

It is a super-2 number, since 2×815839819603² (a number of 25 digits) contains 22 as substring.

Together with 815839819601, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (815839819601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407919909801 + 407919909802.

It is an arithmetic number, because the mean of its divisors is an integer number (407919909802).

Almost surely, 2^815839819603 is an apocalyptic number.

815839819603 is a deficient number, since it is larger than the sum of its proper divisors (1).

815839819603 is an equidigital number, since it uses as much as digits as its factorization.

815839819603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11197440, while the sum is 61.

The spelling of 815839819603 in words is "eight hundred fifteen billion, eight hundred thirty-nine million, eight hundred nineteen thousand, six hundred three".