1555540855917 has 8 divisors (see below), whose sum is σ = 2074085354880. Its totient is φ = 1037011797120.

The previous prime is 1555540855903. The next prime is 1555540855997. The reversal of 1555540855917 is 7195580455551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1555540855917 - 2¹⁵ = 1555540823149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555540855997) 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 7 ways as a sum of consecutive naturals, for example, 3622884 + ... + 4029437.

It is an arithmetic number, because the mean of its divisors is an integer number (259260669360).

Almost surely, 2^{1555540855917} is an apocalyptic number.

It is an amenable number.

1555540855917 is a deficient number, since it is larger than the sum of its proper divisors (518544498963).

1555540855917 is an equidigital number, since it uses as much as digits as its factorization.

1555540855917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7720083.

The product of its (nonzero) digits is 31500000, while the sum is 60.

The spelling of 1555540855917 in words is "one trillion, five hundred fifty-five billion, five hundred forty million, eight hundred fifty-five thousand, nine hundred seventeen".