1545553556623 has 2 divisors, whose sum is σ = 1545553556624. Its totient is φ = 1545553556622.

The previous prime is 1545553556597. The next prime is 1545553556647. The reversal of 1545553556623 is 3266553555451.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1545553556623 - 2¹³ = 1545553548431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1545553556693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 772776778311 + 772776778312.

It is an arithmetic number, because the mean of its divisors is an integer number (772776778312).

Almost surely, 2^{1545553556623} is an apocalyptic number.

1545553556623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1545553556623 is an equidigital number, since it uses as much as digits as its factorization.

1545553556623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40500000, while the sum is 55.

The spelling of 1545553556623 in words is "one trillion, five hundred forty-five billion, five hundred fifty-three million, five hundred fifty-six thousand, six hundred twenty-three".