1361205552645 has 48 divisors (see below), whose sum is σ = 2546903399040. Its totient is φ = 670466848128.

The previous prime is 1361205552631. The next prime is 1361205552653. The reversal of 1361205552645 is 5462555021631.

1361205552645 is a `hidden beast` number, since 1 + 3 + 61 + 20 + 5 + 5 + 526 + 45 = 666.

It is not a de Polignac number, because 1361205552645 - 2⁸ = 1361205552389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1361205552645.

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, 22645407 + ... + 22705436.

It is an arithmetic number, because the mean of its divisors is an integer number (53060487480).

Almost surely, 2^{1361205552645} is an apocalyptic number.

1361205552645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1361205552645 is a deficient number, since it is larger than the sum of its proper divisors (1185697846395).

1361205552645 is a wasteful number, since it uses less digits than its factorization.

1361205552645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45350906 (or 45350903 counting only the distinct ones).

The product of its (nonzero) digits is 1080000, while the sum is 45.

The spelling of 1361205552645 in words is "one trillion, three hundred sixty-one billion, two hundred five million, five hundred fifty-two thousand, six hundred forty-five".