1540651916161 has 4 divisors (see below), whose sum is σ = 1540657037524. Its totient is φ = 1540646794800.

The previous prime is 1540651916093. The next prime is 1540651916171. The reversal of 1540651916161 is 1616191560451.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 159744901761 + 1380907014400 = 399681^2 + 1175120^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540651916161 - 2²⁵ = 1540618361729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1540651916171) 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, 2079270 + ... + 2721151.

It is an arithmetic number, because the mean of its divisors is an integer number (385164259381).

Almost surely, 2^{1540651916161} is an apocalyptic number.

It is an amenable number.

1540651916161 is a deficient number, since it is larger than the sum of its proper divisors (5121363).

1540651916161 is an equidigital number, since it uses as much as digits as its factorization.

1540651916161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5121362.

The product of its (nonzero) digits is 194400, while the sum is 46.

The spelling of 1540651916161 in words is "one trillion, five hundred forty billion, six hundred fifty-one million, nine hundred sixteen thousand, one hundred sixty-one".