55065474978 has 128 divisors (see below), whose sum is σ = 122527987200. Its totient is φ = 16439334912.

The previous prime is 55065474977. The next prime is 55065475021. The reversal of 55065474978 is 87947456055.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (55065474977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18875976 + ... + 18878892.

It is an arithmetic number, because the mean of its divisors is an integer number (957249900).

Almost surely, 2^55065474978 is an apocalyptic number.

55065474978 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

55065474978 is an abundant number, since it is smaller than the sum of its proper divisors (67462512222).

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

55065474978 is a wasteful number, since it uses less digits than its factorization.

55065474978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3116.

The product of its (nonzero) digits is 42336000, while the sum is 60.

The spelling of 55065474978 in words is "fifty-five billion, sixty-five million, four hundred seventy-four thousand, nine hundred seventy-eight".