845504278061 has 4 divisors (see below), whose sum is σ = 845509189632. Its totient is φ = 845499366492.

The previous prime is 845504278051. The next prime is 845504278103. The reversal of 845504278061 is 160872405548.

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 845504278061 - 2²⁶ = 845437169197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845504278051) 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, 2187821 + ... + 2545106.

It is an arithmetic number, because the mean of its divisors is an integer number (211377297408).

Almost surely, 2^845504278061 is an apocalyptic number.

It is an amenable number.

845504278061 is a deficient number, since it is larger than the sum of its proper divisors (4911571).

845504278061 is a wasteful number, since it uses less digits than its factorization.

845504278061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4911570.

The product of its (nonzero) digits is 2150400, while the sum is 50.

The spelling of 845504278061 in words is "eight hundred forty-five billion, five hundred four million, two hundred seventy-eight thousand, sixty-one".