855557749 has 8 divisors (see below), whose sum is σ = 893073600. Its totient is φ = 818068416.

The previous prime is 855557741. The next prime is 855557753. The reversal of 855557749 is 947755558.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 855557749 - 2³ = 855557741 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 855557749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855557741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88534 + ... + 97720.

It is an arithmetic number, because the mean of its divisors is an integer number (111634200).

Almost surely, 2^855557749 is an apocalyptic number.

It is an amenable number.

855557749 is a deficient number, since it is larger than the sum of its proper divisors (37515851).

855557749 is a wasteful number, since it uses less digits than its factorization.

855557749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13259.

The product of its digits is 8820000, while the sum is 55.

The square root of 855557749 is about 29249.9187862120. The cubic root of 855557749 is about 949.3283337273.

The spelling of 855557749 in words is "eight hundred fifty-five million, five hundred fifty-seven thousand, seven hundred forty-nine".