4165540261021 has 8 divisors (see below), whose sum is σ = 4170893383800. Its totient is φ = 4160190440448.

The previous prime is 4165540260989. The next prime is 4165540261027. The reversal of 4165540261021 is 1201620455614.

It can be written as a sum of positive squares in 4 ways, for example, as 3050562655396 + 1114977605625 = 1746586^2 + 1055925^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4165540261021 - 2⁵ = 4165540260989 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 (4165540261027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1703925 + ... + 3351781.

It is an arithmetic number, because the mean of its divisors is an integer number (521361672975).

Almost surely, 2^{4165540261021} is an apocalyptic number.

It is an amenable number.

4165540261021 is a deficient number, since it is larger than the sum of its proper divisors (5353122779).

4165540261021 is a wasteful number, since it uses less digits than its factorization.

4165540261021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651103.

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 4165540261021 in words is "four trillion, one hundred sixty-five billion, five hundred forty million, two hundred sixty-one thousand, twenty-one".