1266782715 has 48 divisors (see below), whose sum is σ = 2399304960. Its totient is φ = 613189440.

The previous prime is 1266782711. The next prime is 1266782743. The reversal of 1266782715 is 5172876621.

1266782715 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1266782715 - 2² = 1266782711 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1266782711) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 364074 + ... + 367536.

It is an arithmetic number, because the mean of its divisors is an integer number (49985520).

Almost surely, 2^1266782715 is an apocalyptic number.

1266782715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1266782715 is a deficient number, since it is larger than the sum of its proper divisors (1132522245).

1266782715 is a wasteful number, since it uses less digits than its factorization.

1266782715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4224 (or 4221 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 1266782715 is about 35591.8911411012. The cubic root of 1266782715 is about 1082.0168972571.

The spelling of 1266782715 in words is "one billion, two hundred sixty-six million, seven hundred eighty-two thousand, seven hundred fifteen".