1305435551555 has 4 divisors (see below), whose sum is σ = 1566522661872. Its totient is φ = 1044348441240.

The previous prime is 1305435551473. The next prime is 1305435551561. The reversal of 1305435551555 is 5551555345031.

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

It is a de Polignac number, because none of the positive numbers 2^k-1305435551555 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130543555151 + ... + 130543555160.

It is an arithmetic number, because the mean of its divisors is an integer number (391630665468).

Almost surely, 2^{1305435551555} is an apocalyptic number.

1305435551555 is a deficient number, since it is larger than the sum of its proper divisors (261087110317).

1305435551555 is an equidigital number, since it uses as much as digits as its factorization.

1305435551555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261087110316.

The product of its (nonzero) digits is 2812500, while the sum is 47.

The spelling of 1305435551555 in words is "one trillion, three hundred five billion, four hundred thirty-five million, five hundred fifty-one thousand, five hundred fifty-five".