845437378861 has 16 divisors (see below), whose sum is σ = 894378155904. Its totient is φ = 797514246144.

The previous prime is 845437378811. The next prime is 845437378883. The reversal of 845437378861 is 168873734548.

It is a cyclic number.

It is not a de Polignac number, because 845437378861 - 2¹⁷ = 845437247789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 845437378793 and 845437378802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845437378811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19432845 + ... + 19476301.

It is an arithmetic number, because the mean of its divisors is an integer number (55898634744).

Almost surely, 2^845437378861 is an apocalyptic number.

It is an amenable number.

845437378861 is a deficient number, since it is larger than the sum of its proper divisors (48940777043).

845437378861 is a wasteful number, since it uses less digits than its factorization.

845437378861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55140.

The product of its digits is 108380160, while the sum is 64.

The spelling of 845437378861 in words is "eight hundred forty-five billion, four hundred thirty-seven million, three hundred seventy-eight thousand, eight hundred sixty-one".