855817649653 has 2 divisors, whose sum is σ = 855817649654. Its totient is φ = 855817649652.

The previous prime is 855817649641. The next prime is 855817649699. The reversal of 855817649653 is 356946718558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 524694512164 + 331123137489 = 724358^2 + 575433^2 .

It is a cyclic number.

It is not a de Polignac number, because 855817649653 - 2¹⁷ = 855817518581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855817649633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427908824826 + 427908824827.

It is an arithmetic number, because the mean of its divisors is an integer number (427908824827).

Almost surely, 2^855817649653 is an apocalyptic number.

It is an amenable number.

855817649653 is a deficient number, since it is larger than the sum of its proper divisors (1).

855817649653 is an equidigital number, since it uses as much as digits as its factorization.

855817649653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728000, while the sum is 67.

The spelling of 855817649653 in words is "eight hundred fifty-five billion, eight hundred seventeen million, six hundred forty-nine thousand, six hundred fifty-three".