1555606001617 has 4 divisors (see below), whose sum is σ = 1555608738996. Its totient is φ = 1555603264240.

The previous prime is 1555606001597. The next prime is 1555606001623. The reversal of 1555606001617 is 7161006065551.

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

It can be written as a sum of positive squares in 2 ways, for example, as 231838398016 + 1323767603601 = 481496^2 + 1150551^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555606001617 - 2¹⁵ = 1555605968849 is a prime.

It is a super-2 number, since 2×1555606001617² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1555606001717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161134 + ... + 1771207.

It is an arithmetic number, because the mean of its divisors is an integer number (388902184749).

Almost surely, 2^{1555606001617} is an apocalyptic number.

It is an amenable number.

1555606001617 is a deficient number, since it is larger than the sum of its proper divisors (2737379).

1555606001617 is an equidigital number, since it uses as much as digits as its factorization.

1555606001617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737378.

The product of its (nonzero) digits is 189000, while the sum is 43.

The spelling of 1555606001617 in words is "one trillion, five hundred fifty-five billion, six hundred six million, one thousand, six hundred seventeen".