1361255051205 has 96 divisors (see below), whose sum is σ = 2878486640640. Its totient is φ = 581232516480.

The previous prime is 1361255051141. The next prime is 1361255051239. The reversal of 1361255051205 is 5021505521631.

1361255051205 is a `hidden beast` number, since 1 + 3 + 6 + 1 + 25 + 505 + 120 + 5 = 666.

It is not a de Polignac number, because 1361255051205 - 2⁶ = 1361255051141 is a prime.

It is a super-2 number, since 2×1361255051205² (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 1361255051205.

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, 1176787 + ... + 2026656.

It is an arithmetic number, because the mean of its divisors is an integer number (29984235840).

Almost surely, 2^{1361255051205} is an apocalyptic number.

1361255051205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1361255051205 is an abundant number, since it is smaller than the sum of its proper divisors (1517231589435).

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

1361255051205 is a wasteful number, since it uses less digits than its factorization.

1361255051205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3203551 (or 3203548 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The spelling of 1361255051205 in words is "one trillion, three hundred sixty-one billion, two hundred fifty-five million, fifty-one thousand, two hundred five".