1198561860405 has 384 divisors, whose sum is σ = 2775005356032. Its totient is φ = 482365559808.

The previous prime is 1198561860299. The next prime is 1198561860409. The reversal of 1198561860405 is 5040681658911.

1198561860405 is a `hidden beast` number, since 1 + 1 + 9 + 8 + 56 + 186 + 0 + 405 = 666.

It is not a de Polignac number, because 1198561860405 - 2⁷ = 1198561860277 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1198561860409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 1635145419 + ... + 1635146151.

It is an arithmetic number, because the mean of its divisors is an integer number (7226576448).

Almost surely, 2^{1198561860405} is an apocalyptic number.

1198561860405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1198561860405 is an abundant number, since it is smaller than the sum of its proper divisors (1576443495627).

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

1198561860405 is a wasteful number, since it uses less digits than its factorization.

1198561860405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1439 (or 1427 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 54.

The spelling of 1198561860405 in words is "one trillion, one hundred ninety-eight billion, five hundred sixty-one million, eight hundred sixty thousand, four hundred five".