855332551921 has 8 divisors (see below), whose sum is σ = 867395476800. Its totient is φ = 843270071280.

The previous prime is 855332551903. The next prime is 855332551939. The reversal of 855332551921 is 129155233558.

It is an interprime number because it is at equal distance from previous prime (855332551903) and next prime (855332551939).

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

It is a cyclic number.

It is not a de Polignac number, because 855332551921 - 2¹⁹ = 855332027633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855332551901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6632070 + ... + 6759808.

It is an arithmetic number, because the mean of its divisors is an integer number (108424434600).

Almost surely, 2^855332551921 is an apocalyptic number.

It is an amenable number.

855332551921 is a deficient number, since it is larger than the sum of its proper divisors (12062924879).

855332551921 is a wasteful number, since it uses less digits than its factorization.

855332551921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222119.

The product of its digits is 1620000, while the sum is 49.

The spelling of 855332551921 in words is "eight hundred fifty-five billion, three hundred thirty-two million, five hundred fifty-one thousand, nine hundred twenty-one".