1066265856 has 90 divisors (see below), whose sum is σ = 3179473682. Its totient is φ = 355415040.

The previous prime is 1066265831. The next prime is 1066265861. The reversal of 1066265856 is 6585626601.

It is a happy number.

1066265856 is a `hidden beast` number, since 1 + 0 + 6 + 62 + 6 + 585 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 949625856 + 116640000 = 30816^2 + 10800^2 .

It is a super-2 number, since 2×1066265856² = 2273845751342825472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4975 + ... + 46446.

Almost surely, 2^1066265856 is an apocalyptic number.

1066265856 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 1066265856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1589736841).

1066265856 is an abundant number, since it is smaller than the sum of its proper divisors (2113207826).

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

1066265856 is an frugal number, since it uses more digits than its factorization.

1066265856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51449 (or 51426 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The square root of 1066265856 is about 32653.7265254672. The cubic root of 1066265856 is about 1021.6179167441.

The spelling of 1066265856 in words is "one billion, sixty-six million, two hundred sixty-five thousand, eight hundred fifty-six".