855185501540393 has 4 divisors (see below), whose sum is σ = 855185569709508. Its totient is φ = 855185433371280.

The previous prime is 855185501540371. The next prime is 855185501540413. The reversal of 855185501540393 is 393045105581558.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 462440423607184 + 392745077933209 = 21504428^2 + 19817797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-855185501540393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855185501440393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9221498 + ... + 42372243.

It is an arithmetic number, because the mean of its divisors is an integer number (213796392427377).

Almost surely, 2^{855185501540393} is an apocalyptic number.

It is an amenable number.

855185501540393 is a deficient number, since it is larger than the sum of its proper divisors (68169115).

855185501540393 is a wasteful number, since it uses less digits than its factorization.

855185501540393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68169114.

The product of its (nonzero) digits is 64800000, while the sum is 62.

The spelling of 855185501540393 in words is "eight hundred fifty-five trillion, one hundred eighty-five billion, five hundred one million, five hundred forty thousand, three hundred ninety-three".