855505557 has 28 divisors (see below), whose sum is σ = 1285223724. Its totient is φ = 569203200.

The previous prime is 855505529. The next prime is 855505559. The reversal of 855505557 is 755505558.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 847159236 + 8346321 = 29106^2 + 2889^2 .

It is not a de Polignac number, because 855505557 - 2¹⁸ = 855243413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855505559) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 533557 + ... + 535157.

Almost surely, 2^855505557 is an apocalyptic number.

It is an amenable number.

855505557 is a deficient number, since it is larger than the sum of its proper divisors (429718167).

855505557 is an equidigital number, since it uses as much as digits as its factorization.

855505557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2352 (or 2337 counting only the distinct ones).

The product of its (nonzero) digits is 875000, while the sum is 45.

The square root of 855505557 is about 29249.0265991879. The cubic root of 855505557 is about 949.3090292241.

Subtracting from 855505557 its reverse (755505558), we obtain a palindrome (99999999).

The spelling of 855505557 in words is "eight hundred fifty-five million, five hundred five thousand, five hundred fifty-seven".