1555545113491 has 4 divisors (see below), whose sum is σ = 1555589915992. Its totient is φ = 1555500310992.

The previous prime is 1555545113489. The next prime is 1555545113501. The reversal of 1555545113491 is 1943115455551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1555545113491 - 2¹ = 1555545113489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1555545113431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22349130 + ... + 22418623.

It is an arithmetic number, because the mean of its divisors is an integer number (388897478998).

Almost surely, 2^{1555545113491} is an apocalyptic number.

1555545113491 is a deficient number, since it is larger than the sum of its proper divisors (44802501).

1555545113491 is an equidigital number, since it uses as much as digits as its factorization.

1555545113491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44802500.

The product of its digits is 1350000, while the sum is 49.

The spelling of 1555545113491 in words is "one trillion, five hundred fifty-five billion, five hundred forty-five million, one hundred thirteen thousand, four hundred ninety-one".