1555606001623 has 2 divisors, whose sum is σ = 1555606001624. Its totient is φ = 1555606001622.

The previous prime is 1555606001597. The next prime is 1555606001639. The reversal of 1555606001623 is 3261006065551.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1555606001623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555606001023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777803000811 + 777803000812.

It is an arithmetic number, because the mean of its divisors is an integer number (777803000812).

Almost surely, 2^{1555606001623} is an apocalyptic number.

1555606001623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555606001623 is an equidigital number, since it uses as much as digits as its factorization.

1555606001623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 1555606001623 in words is "one trillion, five hundred fifty-five billion, six hundred six million, one thousand, six hundred twenty-three".