2115078785 has 4 divisors (see below), whose sum is σ = 2538094548. Its totient is φ = 1692063024.

The previous prime is 2115078773. The next prime is 2115078799. The reversal of 2115078785 is 5878705112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1185011776 + 930067009 = 34424^2 + 30497^2 .

It is a cyclic number.

It is not a de Polignac number, because 2115078785 - 2¹⁰ = 2115077761 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211507874 + ... + 211507883.

It is an arithmetic number, because the mean of its divisors is an integer number (634523637).

Almost surely, 2^2115078785 is an apocalyptic number.

It is an amenable number.

2115078785 is a deficient number, since it is larger than the sum of its proper divisors (423015763).

2115078785 is an equidigital number, since it uses as much as digits as its factorization.

2115078785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423015762.

The product of its (nonzero) digits is 156800, while the sum is 44.

The square root of 2115078785 is about 45989.9857034116. The cubic root of 2115078785 is about 1283.6368704997.

The spelling of 2115078785 in words is "two billion, one hundred fifteen million, seventy-eight thousand, seven hundred eighty-five".