1115610161555 has 4 divisors (see below), whose sum is σ = 1338732193872. Its totient is φ = 892488129240.

The previous prime is 1115610161531. The next prime is 1115610161563. The reversal of 1115610161555 is 5551610165111.

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

It is not a de Polignac number, because 1115610161555 - 2²⁶ = 1115543052691 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111561016151 + ... + 111561016160.

It is an arithmetic number, because the mean of its divisors is an integer number (334683048468).

Almost surely, 2^{1115610161555} is an apocalyptic number.

1115610161555 is a deficient number, since it is larger than the sum of its proper divisors (223122032317).

1115610161555 is an equidigital number, since it uses as much as digits as its factorization.

1115610161555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223122032316.

The product of its (nonzero) digits is 22500, while the sum is 38.

The spelling of 1115610161555 in words is "one trillion, one hundred fifteen billion, six hundred ten million, one hundred sixty-one thousand, five hundred fifty-five".