855891653 has 4 divisors (see below), whose sum is σ = 863743980. Its totient is φ = 848039328.

The previous prime is 855891649. The next prime is 855891661. The reversal of 855891653 is 356198558.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 356198558 = 2 ⋅178099279.

It can be written as a sum of positive squares in 2 ways, for example, as 689430049 + 166461604 = 26257^2 + 12902^2 .

It is a cyclic number.

It is not a de Polignac number, because 855891653 - 2² = 855891649 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 (855891853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3926000 + ... + 3926217.

It is an arithmetic number, because the mean of its divisors is an integer number (215935995).

Almost surely, 2^855891653 is an apocalyptic number.

It is an amenable number.

855891653 is a deficient number, since it is larger than the sum of its proper divisors (7852327).

855891653 is a wasteful number, since it uses less digits than its factorization.

855891653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7852326.

The product of its digits is 1296000, while the sum is 50.

The square root of 855891653 is about 29255.6260059497. The cubic root of 855891653 is about 949.4518178132.

The spelling of 855891653 in words is "eight hundred fifty-five million, eight hundred ninety-one thousand, six hundred fifty-three".