551320345400 has 384 divisors, whose sum is σ = 1485444925440. Its totient is φ = 188337600000.

The previous prime is 551320345391. The next prime is 551320345417. The reversal of 551320345400 is 4543023155.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1054149539 + ... + 1054150061.

It is an arithmetic number, because the mean of its divisors is an integer number (3868346160).

Almost surely, 2^551320345400 is an apocalyptic number.

551320345400 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 551320345400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (742722462720).

551320345400 is an abundant number, since it is smaller than the sum of its proper divisors (934124580040).

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

551320345400 is a wasteful number, since it uses less digits than its factorization.

551320345400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907 (or 898 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 32.

Adding to 551320345400 its reverse (4543023155), we get a palindrome (555863368555).

The spelling of 551320345400 in words is "five hundred fifty-one billion, three hundred twenty million, three hundred forty-five thousand, four hundred".