1605011100655 has 4 divisors (see below), whose sum is σ = 1926013320792. Its totient is φ = 1284008880520.

The previous prime is 1605011100653. The next prime is 1605011100661. The reversal of 1605011100655 is 5560011105061.

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

It is not a de Polignac number, because 1605011100655 - 2¹ = 1605011100653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605011100653) 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, 160501110061 + ... + 160501110070.

It is an arithmetic number, because the mean of its divisors is an integer number (481503330198).

Almost surely, 2^{1605011100655} is an apocalyptic number.

1605011100655 is a deficient number, since it is larger than the sum of its proper divisors (321002220137).

1605011100655 is an equidigital number, since it uses as much as digits as its factorization.

1605011100655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321002220136.

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 1605011100655 in words is "one trillion, six hundred five billion, eleven million, one hundred thousand, six hundred fifty-five".