1540565678213 has 4 divisors (see below), whose sum is σ = 1541627406528. Its totient is φ = 1539503949900.

The previous prime is 1540565678207. The next prime is 1540565678221. The reversal of 1540565678213 is 3128765650451.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1540565678213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540565678273) 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, 530861981 + ... + 530864882.

It is an arithmetic number, because the mean of its divisors is an integer number (385406851632).

Almost surely, 2^{1540565678213} is an apocalyptic number.

It is an amenable number.

1540565678213 is a deficient number, since it is larger than the sum of its proper divisors (1061728315).

1540565678213 is a wasteful number, since it uses less digits than its factorization.

1540565678213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061728314.

The product of its (nonzero) digits is 6048000, while the sum is 53.

The spelling of 1540565678213 in words is "one trillion, five hundred forty billion, five hundred sixty-five million, six hundred seventy-eight thousand, two hundred thirteen".