53778772818 has 48 divisors (see below), whose sum is σ = 120563403480. Its totient is φ = 17304553728.

The previous prime is 53778772811. The next prime is 53778772829. The reversal of 53778772818 is 81827787735.

53778772818 is a `hidden beast` number, since 537 + 7 + 8 + 77 + 28 + 1 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 17031033009 + 36747739809 = 130503^2 + 191697^2 .

It is a super-2 number, since 2×53778772818² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (53778772811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3948396 + ... + 3961992.

Almost surely, 2^53778772818 is an apocalyptic number.

53778772818 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

53778772818 is an abundant number, since it is smaller than the sum of its proper divisors (66784630662).

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

53778772818 is a wasteful number, since it uses less digits than its factorization.

53778772818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21211 (or 21208 counting only the distinct ones).

The product of its digits is 36879360, while the sum is 63.

The spelling of 53778772818 in words is "fifty-three billion, seven hundred seventy-eight million, seven hundred seventy-two thousand, eight hundred eighteen".