1261567166265 has 96 divisors (see below), whose sum is σ = 2513453918976. Its totient is φ = 573408944640.

The previous prime is 1261567166231. The next prime is 1261567166273. The reversal of 1261567166265 is 5626617651621.

1261567166265 is a `hidden beast` number, since 1 + 2 + 6 + 1 + 5 + 6 + 7 + 1 + 6 + 626 + 5 = 666.

It is not a de Polignac number, because 1261567166265 - 2⁷ = 1261567166137 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 107535450 + ... + 107547180.

It is an arithmetic number, because the mean of its divisors is an integer number (26181811656).

Almost surely, 2^{1261567166265} is an apocalyptic number.

1261567166265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1261567166265 is a deficient number, since it is larger than the sum of its proper divisors (1251886752711).

1261567166265 is a wasteful number, since it uses less digits than its factorization.

1261567166265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13679 (or 13676 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The spelling of 1261567166265 in words is "one trillion, two hundred sixty-one billion, five hundred sixty-seven million, one hundred sixty-six thousand, two hundred sixty-five".