549638566400 has 960 divisors, whose sum is σ = 1826668800000. Its totient is φ = 162028339200.

The previous prime is 549638566397. The next prime is 549638566439. The reversal of 549638566400 is 4665836945.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 917593301 + ... + 917593899.

It is an arithmetic number, because the mean of its divisors is an integer number (1902780000).

Almost surely, 2^549638566400 is an apocalyptic number.

549638566400 is a gapful number since it is divisible by the number (50) 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 549638566400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (913334400000).

549638566400 is an abundant number, since it is smaller than the sum of its proper divisors (1277030233600).

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

549638566400 is a wasteful number, since it uses less digits than its factorization.

549638566400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678 (or 643 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 56.

The spelling of 549638566400 in words is "five hundred forty-nine billion, six hundred thirty-eight million, five hundred sixty-six thousand, four hundred".