4165205561545 has 16 divisors (see below), whose sum is σ = 5866667912448. Its totient is φ = 2778947956800.

The previous prime is 4165205561423. The next prime is 4165205561579. The reversal of 4165205561545 is 5451655025614.

It is not a de Polignac number, because 4165205561545 - 2¹¹ = 4165205559497 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1608186181 + ... + 1608188770.

It is an arithmetic number, because the mean of its divisors is an integer number (366666744528).

Almost surely, 2^{4165205561545} is an apocalyptic number.

It is an amenable number.

4165205561545 is a deficient number, since it is larger than the sum of its proper divisors (1701462350903).

4165205561545 is a wasteful number, since it uses less digits than its factorization.

4165205561545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3216375000.

The product of its (nonzero) digits is 3600000, while the sum is 49.

The spelling of 4165205561545 in words is "four trillion, one hundred sixty-five billion, two hundred five million, five hundred sixty-one thousand, five hundred forty-five".