1555153978003 has 2 divisors, whose sum is σ = 1555153978004. Its totient is φ = 1555153978002.

The previous prime is 1555153977991. The next prime is 1555153978019. The reversal of 1555153978003 is 3008793515551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1555153978003 - 2³³ = 1546564043411 is a prime.

It is not a weakly prime, because it can be changed into another prime (1555153978043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777576989001 + 777576989002.

It is an arithmetic number, because the mean of its divisors is an integer number (777576989002).

Almost surely, 2^{1555153978003} is an apocalyptic number.

1555153978003 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555153978003 is an equidigital number, since it uses as much as digits as its factorization.

1555153978003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2835000, while the sum is 52.

The spelling of 1555153978003 in words is "one trillion, five hundred fifty-five billion, one hundred fifty-three million, nine hundred seventy-eight thousand, three".