1265640105 has 8 divisors (see below), whose sum is σ = 2025024192. Its totient is φ = 675008048.

The previous prime is 1265640097. The next prime is 1265640133. The reversal of 1265640105 is 5010465621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1265640105 - 2³ = 1265640097 is a prime.

It is a super-2 number, since 2×1265640105² = 3203689750768822050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42187989 + ... + 42188018.

It is an arithmetic number, because the mean of its divisors is an integer number (253128024).

Almost surely, 2^1265640105 is an apocalyptic number.

1265640105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1265640105 is a deficient number, since it is larger than the sum of its proper divisors (759384087).

1265640105 is an equidigital number, since it uses as much as digits as its factorization.

1265640105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84376015.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 1265640105 is about 35575.8359705011. The cubic root of 1265640105 is about 1081.6914809588.

The spelling of 1265640105 in words is "one billion, two hundred sixty-five million, six hundred forty thousand, one hundred five".