549181361664 has 240 divisors, whose sum is σ = 1760288785200. Its totient is φ = 168978161664.

The previous prime is 549181361593. The next prime is 549181361669. The reversal of 549181361664 is 466163181945.

549181361664 is a `hidden beast` number, since 5 + 4 + 9 + 1 + 8 + 13 + 616 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 549181361664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549181361669) 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, 2218722 + ... + 2453790.

It is an arithmetic number, because the mean of its divisors is an integer number (7334536605).

Almost surely, 2^549181361664 is an apocalyptic number.

549181361664 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 549181361664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (880144392600).

549181361664 is an abundant number, since it is smaller than the sum of its proper divisors (1211107423536).

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

549181361664 is a wasteful number, since it uses less digits than its factorization.

549181361664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235122 (or 235087 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The spelling of 549181361664 in words is "five hundred forty-nine billion, one hundred eighty-one million, three hundred sixty-one thousand, six hundred sixty-four".