1266529056 has 192 divisors, whose sum is σ = 3892654080. Its totient is φ = 357073920.

The previous prime is 1266529013. The next prime is 1266529057. The reversal of 1266529056 is 6509256621.

It is a super-2 number, since 2×1266529056² = 3208191699384502272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1266528999 and 1266529017.

It is not an unprimeable number, because it can be changed into a prime (1266529057) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 734211 + ... + 735933.

It is an arithmetic number, because the mean of its divisors is an integer number (20274240).

Almost surely, 2^1266529056 is an apocalyptic number.

1266529056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266529056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1946327040).

1266529056 is an abundant number, since it is smaller than the sum of its proper divisors (2626125024).

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

1266529056 is a wasteful number, since it uses less digits than its factorization.

1266529056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799 (or 1791 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 1266529056 is about 35588.3275246253. The cubic root of 1266529056 is about 1081.9446718622.

The spelling of 1266529056 in words is "one billion, two hundred sixty-six million, five hundred twenty-nine thousand, fifty-six".