845861226640 has 40 divisors (see below), whose sum is σ = 1999960030080. Its totient is φ = 332609836416.

The previous prime is 845861226619. The next prime is 845861226649. The reversal of 845861226640 is 46622168548.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (845861226649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89599224 + ... + 89608663.

It is an arithmetic number, because the mean of its divisors is an integer number (49999000752).

Almost surely, 2^845861226640 is an apocalyptic number.

845861226640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

845861226640 is an abundant number, since it is smaller than the sum of its proper divisors (1154098803440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

845861226640 is a wasteful number, since it uses less digits than its factorization.

845861226640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179207959 (or 179207953 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 52.

The spelling of 845861226640 in words is "eight hundred forty-five billion, eight hundred sixty-one million, two hundred twenty-six thousand, six hundred forty".