855391669649 has 4 divisors (see below), whose sum is σ = 933154548720. Its totient is φ = 777628790580.

The previous prime is 855391669603. The next prime is 855391669669. The reversal of 855391669649 is 946966193558.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 855391669649 - 2⁸ = 855391669393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855391669669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38881439519 + ... + 38881439540.

It is an arithmetic number, because the mean of its divisors is an integer number (233288637180).

Almost surely, 2^855391669649 is an apocalyptic number.

It is an amenable number.

855391669649 is a deficient number, since it is larger than the sum of its proper divisors (77762879071).

855391669649 is a wasteful number, since it uses less digits than its factorization.

855391669649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77762879070.

The product of its digits is 377913600, while the sum is 71.

The spelling of 855391669649 in words is "eight hundred fifty-five billion, three hundred ninety-one million, six hundred sixty-nine thousand, six hundred forty-nine".