549778021641 has 24 divisors (see below), whose sum is σ = 812646971136. Its totient is φ = 357970687200.

The previous prime is 549778021619. The next prime is 549778021673. The reversal of 549778021641 is 146120877945.

549778021641 is a `hidden beast` number, since 5 + 497 + 78 + 0 + 21 + 64 + 1 = 666.

It is not a de Polignac number, because 549778021641 - 2⁵ = 549778021609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (549778021601) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 6982191 + ... + 7060491.

It is an arithmetic number, because the mean of its divisors is an integer number (33860290464).

Almost surely, 2^549778021641 is an apocalyptic number.

It is an amenable number.

549778021641 is a deficient number, since it is larger than the sum of its proper divisors (262868949495).

549778021641 is a wasteful number, since it uses less digits than its factorization.

549778021641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96493 (or 96490 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 549778021641 in words is "five hundred forty-nine billion, seven hundred seventy-eight million, twenty-one thousand, six hundred forty-one".