855191672039 has 2 divisors, whose sum is σ = 855191672040. Its totient is φ = 855191672038.

The previous prime is 855191671987. The next prime is 855191672063. The reversal of 855191672039 is 930276191558.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 855191672039 - 2¹² = 855191667943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855191672339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427595836019 + 427595836020.

It is an arithmetic number, because the mean of its divisors is an integer number (427595836020).

Almost surely, 2^855191672039 is an apocalyptic number.

855191672039 is a deficient number, since it is larger than the sum of its proper divisors (1).

855191672039 is an equidigital number, since it uses as much as digits as its factorization.

855191672039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4082400, while the sum is 56.

The spelling of 855191672039 in words is "eight hundred fifty-five billion, one hundred ninety-one million, six hundred seventy-two thousand, thirty-nine".