1540385015645 has 16 divisors (see below), whose sum is σ = 2136264295680. Its totient is φ = 1044395873664.

The previous prime is 1540385015599. The next prime is 1540385015657. The reversal of 1540385015645 is 5465105830451.

It is a cyclic number.

It is not a de Polignac number, because 1540385015645 - 2³⁰ = 1539311273821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1540385015645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247249697 + ... + 247255926.

It is an arithmetic number, because the mean of its divisors is an integer number (133516518480).

Almost surely, 2^{1540385015645} is an apocalyptic number.

It is an amenable number.

1540385015645 is a deficient number, since it is larger than the sum of its proper divisors (595879280035).

1540385015645 is an equidigital number, since it uses as much as digits as its factorization.

1540385015645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494505724.

The product of its (nonzero) digits is 1440000, while the sum is 47.

The spelling of 1540385015645 in words is "one trillion, five hundred forty billion, three hundred eighty-five million, fifteen thousand, six hundred forty-five".