1265055000505 has 4 divisors (see below), whose sum is σ = 1518066000612. Its totient is φ = 1012044000400.

The previous prime is 1265055000487. The next prime is 1265055000551. The reversal of 1265055000505 is 5050005505621.

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 845414047296 + 419640953209 = 919464^2 + 647797^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1265055000505 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, 126505500046 + ... + 126505500055.

It is an arithmetic number, because the mean of its divisors is an integer number (379516500153).

Almost surely, 2^{1265055000505} is an apocalyptic number.

It is an amenable number.

1265055000505 is a deficient number, since it is larger than the sum of its proper divisors (253011000107).

1265055000505 is an equidigital number, since it uses as much as digits as its factorization.

1265055000505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253011000106.

The product of its (nonzero) digits is 37500, while the sum is 34.

The spelling of 1265055000505 in words is "one trillion, two hundred sixty-five billion, fifty-five million, five hundred five", and thus it is an aban number.