1617221754655 has 24 divisors (see below), whose sum is σ = 2105125171920. Its totient is φ = 1192156842240.

The previous prime is 1617221754619. The next prime is 1617221754719. The reversal of 1617221754655 is 5564571227161.

It is not a de Polignac number, because 1617221754655 - 2²⁷ = 1617087536927 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1200981 + ... + 2162590.

It is an arithmetic number, because the mean of its divisors is an integer number (87713548830).

Almost surely, 2^{1617221754655} is an apocalyptic number.

1617221754655 is a deficient number, since it is larger than the sum of its proper divisors (487903417265).

1617221754655 is a wasteful number, since it uses less digits than its factorization.

1617221754655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3364171 (or 3364158 counting only the distinct ones).

The product of its digits is 3528000, while the sum is 52.

The spelling of 1617221754655 in words is "one trillion, six hundred seventeen billion, two hundred twenty-one million, seven hundred fifty-four thousand, six hundred fifty-five".