1265810687115 has 32 divisors (see below), whose sum is σ = 2181143764800. Its totient is φ = 623152743936.

The previous prime is 1265810687081. The next prime is 1265810687117. The reversal of 1265810687115 is 5117860185621.

It is not a de Polignac number, because 1265810687115 - 2¹² = 1265810683019 is a prime.

It is a super-2 number, since 2×1265810687115² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1265810687117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13789309 + ... + 13880801.

It is an arithmetic number, because the mean of its divisors is an integer number (68160742650).

Almost surely, 2^{1265810687115} is an apocalyptic number.

1265810687115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1265810687115 is a deficient number, since it is larger than the sum of its proper divisors (915333077685).

1265810687115 is a wasteful number, since it uses less digits than its factorization.

1265810687115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162463.

The product of its (nonzero) digits is 806400, while the sum is 51.

The spelling of 1265810687115 in words is "one trillion, two hundred sixty-five billion, eight hundred ten million, six hundred eighty-seven thousand, one hundred fifteen".