1266218540 has 48 divisors (see below), whose sum is σ = 2833754112. Its totient is φ = 474150336.

The previous prime is 1266218537. The next prime is 1266218543. The reversal of 1266218540 is 458126621.

It is an interprime number because it is at equal distance from previous prime (1266218537) and next prime (1266218543).

It is a self number, because there is not a number n which added to its sum of digits gives 1266218540.

It is not an unprimeable number, because it can be changed into a prime (1266218543) 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 15 ways as a sum of consecutive naturals, for example, 7664 + ... + 50903.

It is an arithmetic number, because the mean of its divisors is an integer number (59036544).

Almost surely, 2^1266218540 is an apocalyptic number.

1266218540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266218540 is an abundant number, since it is smaller than the sum of its proper divisors (1567535572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1266218540 is a wasteful number, since it uses less digits than its factorization.

1266218540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58646 (or 58644 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 1266218540 is about 35583.9646470148. The cubic root of 1266218540 is about 1081.8562442050.

The spelling of 1266218540 in words is "one billion, two hundred sixty-six million, two hundred eighteen thousand, five hundred forty".