245402404551220 has 144 divisors (see below), whose sum is σ = 602107786823760. Its totient is φ = 83769896534016.

The previous prime is 245402404551217. The next prime is 245402404551257. The reversal of 245402404551220 is 22155404204542.

It can be written as a sum of positive squares in 8 ways, for example, as 2109105580176 + 243293298971044 = 1452276^2 + 15597862^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 520862874 + ... + 521333806.

It is an arithmetic number, because the mean of its divisors is an integer number (4181304075165).

Almost surely, 2^{245402404551220} is an apocalyptic number.

245402404551220 is a gapful number since it is divisible by the number (20) 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 245402404551220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301053893411880).

245402404551220 is an abundant number, since it is smaller than the sum of its proper divisors (356705382272540).

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

245402404551220 is a wasteful number, since it uses less digits than its factorization.

245402404551220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473282 (or 473273 counting only the distinct ones).

The product of its (nonzero) digits is 512000, while the sum is 40.

Adding to 245402404551220 its reverse (22155404204542), we get a palindrome (267557808755762).

The spelling of 245402404551220 in words is "two hundred forty-five trillion, four hundred two billion, four hundred four million, five hundred fifty-one thousand, two hundred twenty".