845642121280 has 56 divisors (see below), whose sum is σ = 2196747610560. Its totient is φ = 307506224640.

The previous prime is 845642121277. The next prime is 845642121301. The reversal of 845642121280 is 82121246548.

It is a super-2 number, since 2×845642121280² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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, 120116100 + ... + 120123139.

Almost surely, 2^845642121280 is an apocalyptic number.

845642121280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

845642121280 is an abundant number, since it is smaller than the sum of its proper divisors (1351105489280).

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

845642121280 is a wasteful number, since it uses less digits than its factorization.

845642121280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240239267 (or 240239257 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 43.

The spelling of 845642121280 in words is "eight hundred forty-five billion, six hundred forty-two million, one hundred twenty-one thousand, two hundred eighty".