1233420555520 has 36 divisors (see below), whose sum is σ = 2954427677460. Its totient is φ = 493368221696.

The previous prime is 1233420555487. The next prime is 1233420555533. The reversal of 1233420555520 is 255550243321.

It can be written as a sum of positive squares in 2 ways, for example, as 326232884224 + 907187671296 = 571168^2 + 952464^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1233420555520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 481803625 + ... + 481806184.

It is an arithmetic number, because the mean of its divisors is an integer number (82067435485).

Almost surely, 2^{1233420555520} is an apocalyptic number.

1233420555520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1233420555520 is an abundant number, since it is smaller than the sum of its proper divisors (1721007121940).

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

1233420555520 is an frugal number, since it uses more digits than its factorization.

1233420555520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963609830 (or 963609816 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 37.

Adding to 1233420555520 its reverse (255550243321), we get a palindrome (1488970798841).

The spelling of 1233420555520 in words is "one trillion, two hundred thirty-three billion, four hundred twenty million, five hundred fifty-five thousand, five hundred twenty".