1261086165115 has 16 divisors (see below), whose sum is σ = 1729547458560. Its totient is φ = 864715868640.

The previous prime is 1261086165067. The next prime is 1261086165137. The reversal of 1261086165115 is 5115616801621.

It is not a de Polignac number, because 1261086165115 - 2⁹ = 1261086164603 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 486106 + ... + 1660864.

It is an arithmetic number, because the mean of its divisors is an integer number (108096716160).

Almost surely, 2^{1261086165115} is an apocalyptic number.

1261086165115 is a deficient number, since it is larger than the sum of its proper divisors (468461293445).

1261086165115 is a wasteful number, since it uses less digits than its factorization.

1261086165115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205442.

The product of its (nonzero) digits is 86400, while the sum is 43.

The spelling of 1261086165115 in words is "one trillion, two hundred sixty-one billion, eighty-six million, one hundred sixty-five thousand, one hundred fifteen".