851909610545 has 32 divisors (see below), whose sum is σ = 1184518629888. Its totient is φ = 576076313088.

The previous prime is 851909610533. The next prime is 851909610619. The reversal of 851909610545 is 545016909158.

It is a cyclic number.

It is not a de Polignac number, because 851909610545 - 2⁴ = 851909610529 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 19695332 + ... + 19738538.

It is an arithmetic number, because the mean of its divisors is an integer number (37016207184).

Almost surely, 2^851909610545 is an apocalyptic number.

It is an amenable number.

851909610545 is a deficient number, since it is larger than the sum of its proper divisors (332609019343).

851909610545 is a wasteful number, since it uses less digits than its factorization.

851909610545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51009.

The product of its (nonzero) digits is 1944000, while the sum is 53.

The spelling of 851909610545 in words is "eight hundred fifty-one billion, nine hundred nine million, six hundred ten thousand, five hundred forty-five".