1066640040 has 96 divisors (see below), whose sum is σ = 3473987400. Its totient is φ = 283829760.

The previous prime is 1066640023. The next prime is 1066640041. The reversal of 1066640040 is 400466601.

It can be written as a sum of positive squares in 4 ways, for example, as 1058721444 + 7918596 = 32538^2 + 2814^2 .

It is a super-2 number, since 2×1066640040² = 2275441949862403200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1066639986 and 1066640013.

It is not an unprimeable number, because it can be changed into a prime (1066640041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180330 + ... + 186150.

Almost surely, 2^1066640040 is an apocalyptic number.

1066640040 is a gapful number since it is divisible by the number (10) 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 1066640040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1736993700).

1066640040 is an abundant number, since it is smaller than the sum of its proper divisors (2407347360).

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

1066640040 is a wasteful number, since it uses less digits than its factorization.

1066640040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6347 (or 6340 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1066640040 is about 32659.4555986471. The cubic root of 1066640040 is about 1021.7374080099.

The spelling of 1066640040 in words is "one billion, sixty-six million, six hundred forty thousand, forty".