1155401515505 has 4 divisors (see below), whose sum is σ = 1386481818612. Its totient is φ = 924321212400.

The previous prime is 1155401515487. The next prime is 1155401515537. The reversal of 1155401515505 is 5055151045511.

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

It can be written as a sum of positive squares in 2 ways, for example, as 896604459664 + 258797055841 = 946892^2 + 508721^2 .

It is not a de Polignac number, because 1155401515505 - 2⁸ = 1155401515249 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, 115540151546 + ... + 115540151555.

It is an arithmetic number, because the mean of its divisors is an integer number (346620454653).

Almost surely, 2^{1155401515505} is an apocalyptic number.

It is an amenable number.

1155401515505 is a deficient number, since it is larger than the sum of its proper divisors (231080303107).

1155401515505 is an equidigital number, since it uses as much as digits as its factorization.

1155401515505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231080303106.

The product of its (nonzero) digits is 62500, while the sum is 38.

The spelling of 1155401515505 in words is "one trillion, one hundred fifty-five billion, four hundred one million, five hundred fifteen thousand, five hundred five".