1365105161555 has 4 divisors (see below), whose sum is σ = 1638126193872. Its totient is φ = 1092084129240.

The previous prime is 1365105161551. The next prime is 1365105161621. The reversal of 1365105161555 is 5551615015631.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1365105161555 - 2² = 1365105161551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1365105161551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136510516151 + ... + 136510516160.

It is an arithmetic number, because the mean of its divisors is an integer number (409531548468).

Almost surely, 2^{1365105161555} is an apocalyptic number.

1365105161555 is a deficient number, since it is larger than the sum of its proper divisors (273021032317).

1365105161555 is an equidigital number, since it uses as much as digits as its factorization.

1365105161555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273021032316.

The product of its (nonzero) digits is 337500, while the sum is 44.

The spelling of 1365105161555 in words is "one trillion, three hundred sixty-five billion, one hundred five million, one hundred sixty-one thousand, five hundred fifty-five".