855185501540391 has 24 divisors (see below), whose sum is σ = 1326415072477824. Its totient is φ = 488675621674800.

The previous prime is 855185501540371. The next prime is 855185501540413. The reversal of 855185501540391 is 193045105581558.

It is a happy number.

It is not a de Polignac number, because 855185501540391 - 2¹¹ = 855185501538343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855185501540371) 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 23 ways as a sum of consecutive naturals, for example, 29625366 + ... + 50872716.

It is an arithmetic number, because the mean of its divisors is an integer number (55267294686576).

Almost surely, 2^{855185501540391} is an apocalyptic number.

855185501540391 is a deficient number, since it is larger than the sum of its proper divisors (471229570937433).

855185501540391 is a wasteful number, since it uses less digits than its factorization.

855185501540391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21521171 (or 21521164 counting only the distinct ones).

The product of its (nonzero) digits is 21600000, while the sum is 60.

The spelling of 855185501540391 in words is "eight hundred fifty-five trillion, one hundred eighty-five billion, five hundred one million, five hundred forty thousand, three hundred ninety-one".