55020164915978 has 4 divisors (see below), whose sum is σ = 82530247373970. Its totient is φ = 27510082457988.

The previous prime is 55020164915977. The next prime is 55020164915983. The reversal of 55020164915978 is 87951946102055.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 54895755633889 + 124409282089 = 7409167^2 + 352717^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 55020164915978.

It is not an unprimeable number, because it can be changed into a prime (55020164915977) 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 as a sum of consecutive naturals, namely, 13755041228993 + ... + 13755041228996.

Almost surely, 2^{55020164915978} is an apocalyptic number.

55020164915978 is a deficient number, since it is larger than the sum of its proper divisors (27510082457992).

55020164915978 is a wasteful number, since it uses less digits than its factorization.

55020164915978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27510082457991.

The product of its (nonzero) digits is 27216000, while the sum is 62.

The spelling of 55020164915978 in words is "fifty-five trillion, twenty billion, one hundred sixty-four million, nine hundred fifteen thousand, nine hundred seventy-eight".