4156216540561 has 4 divisors (see below), whose sum is σ = 4165232195124. Its totient is φ = 4147200886000.

The previous prime is 4156216540559. The next prime is 4156216540627. The reversal of 4156216540561 is 1650456126514.

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 1331023690000 + 2825192850561 = 1153700^2 + 1680831^2 .

It is a cyclic number.

It is not a de Polignac number, because 4156216540561 - 2¹ = 4156216540559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4156216546561) 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, 4507826590 + ... + 4507827511.

It is an arithmetic number, because the mean of its divisors is an integer number (1041308048781).

Almost surely, 2^{4156216540561} is an apocalyptic number.

It is an amenable number.

4156216540561 is a deficient number, since it is larger than the sum of its proper divisors (9015654563).

4156216540561 is an equidigital number, since it uses as much as digits as its factorization.

4156216540561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9015654562.

The product of its (nonzero) digits is 864000, while the sum is 46.

The spelling of 4156216540561 in words is "four trillion, one hundred fifty-six billion, two hundred sixteen million, five hundred forty thousand, five hundred sixty-one".