1266653140 has 24 divisors (see below), whose sum is σ = 2660925960. Its totient is φ = 506479488.

The previous prime is 1266653111. The next prime is 1266653161. The reversal of 1266653140 is 413566621.

It can be written as a sum of positive squares in 4 ways, for example, as 417630096 + 849023044 = 20436^2 + 29138^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1266653096 and 1266653105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55326 + ... + 74794.

It is an arithmetic number, because the mean of its divisors is an integer number (110871915).

Almost surely, 2^1266653140 is an apocalyptic number.

1266653140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266653140 is an abundant number, since it is smaller than the sum of its proper divisors (1394272820).

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

1266653140 is a wasteful number, since it uses less digits than its factorization.

1266653140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22731 (or 22729 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 1266653140 is about 35590.0708063359. The cubic root of 1266653140 is about 1081.9800040266.

The spelling of 1266653140 in words is "one billion, two hundred sixty-six million, six hundred fifty-three thousand, one hundred forty".