1205551143225 has 72 divisors (see below), whose sum is σ = 2536771927872. Its totient is φ = 539547350400.

The previous prime is 1205551143217. The next prime is 1205551143229. The reversal of 1205551143225 is 5223411555021.

1205551143225 is a `hidden beast` number, since 1 + 205 + 5 + 5 + 11 + 432 + 2 + 5 = 666.

It is not a de Polignac number, because 1205551143225 - 2³ = 1205551143217 is a prime.

It is a super-2 number, since 2×1205551143225² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1205551143225.

It is not an unprimeable number, because it can be changed into a prime (1205551143229) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 18702109 + ... + 18766458.

Almost surely, 2^{1205551143225} is an apocalyptic number.

1205551143225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1205551143225 is an abundant number, since it is smaller than the sum of its proper divisors (1331220784647).

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

1205551143225 is a wasteful number, since it uses less digits than its factorization.

1205551143225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37468607 (or 37468599 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

Adding to 1205551143225 its reverse (5223411555021), we get a palindrome (6428962698246).

The spelling of 1205551143225 in words is "one trillion, two hundred five billion, five hundred fifty-one million, one hundred forty-three thousand, two hundred twenty-five".