1000666540 has 24 divisors (see below), whose sum is σ = 2212000560. Its totient is φ = 379199808.

The previous prime is 1000666523. The next prime is 1000666549. The reversal of 1000666540 is 456660001.

It is a junction number, because it is equal to n+sod(n) for n = 1000666499 and 1000666508.

It is not an unprimeable number, because it can be changed into a prime (1000666549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1316287 + ... + 1317046.

It is an arithmetic number, because the mean of its divisors is an integer number (92166690).

Almost surely, 2^1000666540 is an apocalyptic number.

1000666540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000666540 is an abundant number, since it is smaller than the sum of its proper divisors (1211334020).

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

1000666540 is a wasteful number, since it uses less digits than its factorization.

1000666540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2633361 (or 2633359 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1000666540 is about 31633.3137688735. The cubic root of 1000666540 is about 1000.2221306543. Note that the first 3 decimals are identical.

The spelling of 1000666540 in words is "one billion, six hundred sixty-six thousand, five hundred forty".