1266501380 has 12 divisors (see below), whose sum is σ = 2659652940. Its totient is φ = 506600544.

The previous prime is 1266501367. The next prime is 1266501407. The reversal of 1266501380 is 831056621.

It is a happy number.

1266501380 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 391406656 + 875094724 = 19784^2 + 29582^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31662515 + ... + 31662554.

It is an arithmetic number, because the mean of its divisors is an integer number (221637745).

Almost surely, 2^1266501380 is an apocalyptic number.

1266501380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266501380 is an abundant number, since it is smaller than the sum of its proper divisors (1393151560).

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

1266501380 is a wasteful number, since it uses less digits than its factorization.

1266501380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63325078 (or 63325076 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1266501380 is about 35587.9386871451. The cubic root of 1266501380 is about 1081.9367909747.

The spelling of 1266501380 in words is "one billion, two hundred sixty-six million, five hundred one thousand, three hundred eighty".