55845678978 has 48 divisors (see below), whose sum is σ = 127402716480. Its totient is φ = 17630579232.

The previous prime is 55845678949. The next prime is 55845678979. The reversal of 55845678978 is 87987654855.

55845678978 is a `hidden beast` number, since 5 + 58 + 4 + 567 + 8 + 9 + 7 + 8 = 666.

It is a super-3 number, since 3×55845678978³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (55845678979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1327800 + ... + 1369212.

It is an arithmetic number, because the mean of its divisors is an integer number (2654223260).

Almost surely, 2^55845678978 is an apocalyptic number.

55845678978 is an abundant number, since it is smaller than the sum of its proper divisors (71557037502).

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

55845678978 is a wasteful number, since it uses less digits than its factorization.

55845678978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45383 (or 45380 counting only the distinct ones).

The product of its digits is 677376000, while the sum is 72.

The spelling of 55845678978 in words is "fifty-five billion, eight hundred forty-five million, six hundred seventy-eight thousand, nine hundred seventy-eight".