55303320400 has 60 divisors (see below), whose sum is σ = 132934680252. Its totient is φ = 22109931520.

The previous prime is 55303320383. The next prime is 55303320407. The reversal of 55303320400 is 402330355.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 478034496 + 54825285904 = 21864^2 + 234148^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55303320407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 764184 + ... + 833416.

Almost surely, 2^55303320400 is an apocalyptic number.

55303320400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55303320400 is an abundant number, since it is smaller than the sum of its proper divisors (77631359852).

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

55303320400 is a wasteful number, since it uses less digits than its factorization.

55303320400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71248 (or 71237 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 25.

Adding to 55303320400 its reverse (402330355), we get a palindrome (55705650755).

The spelling of 55303320400 in words is "fifty-five billion, three hundred three million, three hundred twenty thousand, four hundred".