1540066618 has 8 divisors (see below), whose sum is σ = 2445988212. Its totient is φ = 724737216.

The previous prime is 1540066613. The next prime is 1540066657. The reversal of 1540066618 is 8166600451.

It can be written as a sum of positive squares in 2 ways, for example, as 1532487609 + 7579009 = 39147^2 + 2753^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1540066613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22648005 + ... + 22648072.

Almost surely, 2^1540066618 is an apocalyptic number.

1540066618 is a deficient number, since it is larger than the sum of its proper divisors (905921594).

1540066618 is a wasteful number, since it uses less digits than its factorization.

1540066618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45296096.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 1540066618 is about 39243.6825234330. The cubic root of 1540066618 is about 1154.8170016726.

The spelling of 1540066618 in words is "one billion, five hundred forty million, sixty-six thousand, six hundred eighteen".