1555006666665 has 8 divisors (see below), whose sum is σ = 2488010666688. Its totient is φ = 829336888880.

The previous prime is 1555006666643. The next prime is 1555006666667. The reversal of 1555006666665 is 5666666005551.

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

It is not a de Polignac number, because 1555006666665 - 2⁶ = 1555006666601 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1555006666667) 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, 51833555541 + ... + 51833555570.

It is an arithmetic number, because the mean of its divisors is an integer number (311001333336).

Almost surely, 2^{1555006666665} is an apocalyptic number.

1555006666665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1555006666665 is a deficient number, since it is larger than the sum of its proper divisors (933004000023).

1555006666665 is a wasteful number, since it uses less digits than its factorization.

1555006666665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103667111119.

The product of its (nonzero) digits is 29160000, while the sum is 57.

The spelling of 1555006666665 in words is "one trillion, five hundred fifty-five billion, six million, six hundred sixty-six thousand, six hundred sixty-five".