1555332420667 has 2 divisors, whose sum is σ = 1555332420668. Its totient is φ = 1555332420666.

The previous prime is 1555332420643. The next prime is 1555332420751. The reversal of 1555332420667 is 7660242335551.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1555332420667 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1555332420667.

It is not a weakly prime, because it can be changed into another prime (1555338420667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777666210333 + 777666210334.

It is an arithmetic number, because the mean of its divisors is an integer number (777666210334).

Almost surely, 2^{1555332420667} is an apocalyptic number.

1555332420667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555332420667 is an equidigital number, since it uses as much as digits as its factorization.

1555332420667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536000, while the sum is 49.

The spelling of 1555332420667 in words is "one trillion, five hundred fifty-five billion, three hundred thirty-two million, four hundred twenty thousand, six hundred sixty-seven".