1265646311655 has 32 divisors (see below), whose sum is σ = 2209603207680. Its totient is φ = 613514724480.

The previous prime is 1265646311647. The next prime is 1265646311719. The reversal of 1265646311655 is 5561136465621.

It is not a de Polignac number, because 1265646311655 - 2³ = 1265646311647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1265646311598 and 1265646311607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53100 + ... + 1591889.

It is an arithmetic number, because the mean of its divisors is an integer number (69050100240).

Almost surely, 2^{1265646311655} is an apocalyptic number.

1265646311655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1265646311655 is a deficient number, since it is larger than the sum of its proper divisors (943956896025).

1265646311655 is a wasteful number, since it uses less digits than its factorization.

1265646311655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649671.

The product of its digits is 3888000, while the sum is 51.

The spelling of 1265646311655 in words is "one trillion, two hundred sixty-five billion, six hundred forty-six million, three hundred eleven thousand, six hundred fifty-five".