1540666668 has 12 divisors (see below), whose sum is σ = 3594888920. Its totient is φ = 513555552.

The previous prime is 1540666639. The next prime is 1540666681. The reversal of 1540666668 is 8666660451.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64194433 + ... + 64194456.

Almost surely, 2^1540666668 is an apocalyptic number.

It is an amenable number.

1540666668 is an abundant number, since it is smaller than the sum of its proper divisors (2054222252).

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

1540666668 is a wasteful number, since it uses less digits than its factorization.

1540666668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128388896 (or 128388894 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 48.

The square root of 1540666668 is about 39251.3269584609. The cubic root of 1540666668 is about 1154.9669644418.

The spelling of 1540666668 in words is "one billion, five hundred forty million, six hundred sixty-six thousand, six hundred sixty-eight".