855961615 has 32 divisors (see below), whose sum is σ = 1078811136. Its totient is φ = 651233280.

The previous prime is 855961597. The next prime is 855961619. The reversal of 855961615 is 516169558.

It is not a de Polignac number, because 855961615 - 2⁹ = 855961103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855961619) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 3673539 + ... + 3673771.

It is an arithmetic number, because the mean of its divisors is an integer number (33712848).

Almost surely, 2^855961615 is an apocalyptic number.

855961615 is a deficient number, since it is larger than the sum of its proper divisors (222849521).

855961615 is a wasteful number, since it uses less digits than its factorization.

855961615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579.

The product of its digits is 324000, while the sum is 46.

The square root of 855961615 is about 29256.8216831562. The cubic root of 855961615 is about 949.4776870292.

The spelling of 855961615 in words is "eight hundred fifty-five million, nine hundred sixty-one thousand, six hundred fifteen".