851620235149 has 4 divisors (see below), whose sum is σ = 851622601536. Its totient is φ = 851617868764.

The previous prime is 851620235113. The next prime is 851620235153. The reversal of 851620235149 is 941532026158.

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 851620235149 - 2⁷ = 851620235021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 851620235099 and 851620235108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851620235449) 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, 519139 + ... + 1404544.

It is an arithmetic number, because the mean of its divisors is an integer number (212905650384).

Almost surely, 2^851620235149 is an apocalyptic number.

It is an amenable number.

851620235149 is a deficient number, since it is larger than the sum of its proper divisors (2366387).

851620235149 is a wasteful number, since it uses less digits than its factorization.

851620235149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2366386.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 851620235149 in words is "eight hundred fifty-one billion, six hundred twenty million, two hundred thirty-five thousand, one hundred forty-nine".