1540043778639 has 32 divisors (see below), whose sum is σ = 2131884048384. Its totient is φ = 987849066240.

The previous prime is 1540043778631. The next prime is 1540043778659. The reversal of 1540043778639 is 9368773400451.

It is not a de Polignac number, because 1540043778639 - 2³ = 1540043778631 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540043778631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11223027 + ... + 11359419.

It is an arithmetic number, because the mean of its divisors is an integer number (66621376512).

Almost surely, 2^{1540043778639} is an apocalyptic number.

1540043778639 is a deficient number, since it is larger than the sum of its proper divisors (591840269745).

1540043778639 is a wasteful number, since it uses less digits than its factorization.

1540043778639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137127.

The product of its (nonzero) digits is 15240960, while the sum is 57.

The spelling of 1540043778639 in words is "one trillion, five hundred forty billion, forty-three million, seven hundred seventy-eight thousand, six hundred thirty-nine".