4578139165021 has 2 divisors, whose sum is σ = 4578139165022. Its totient is φ = 4578139165020.

The previous prime is 4578139164947. The next prime is 4578139165037. The reversal of 4578139165021 is 1205619318754.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3211084802500 + 1367054362521 = 1791950^2 + 1169211^2 .

It is a cyclic number.

It is not a de Polignac number, because 4578139165021 - 2¹⁵ = 4578139132253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4578139165021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4578139165051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2289069582510 + 2289069582511.

It is an arithmetic number, because the mean of its divisors is an integer number (2289069582511).

It is a 2-persistent number, because it is pandigital, and so is 2⋅4578139165021 = 9156278330042, but 3⋅4578139165021 = 13734417495063 is not.

Almost surely, 2^{4578139165021} is an apocalyptic number.

It is an amenable number.

4578139165021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4578139165021 is an equidigital number, since it uses as much as digits as its factorization.

4578139165021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 4578139165021 in words is "four trillion, five hundred seventy-eight billion, one hundred thirty-nine million, one hundred sixty-five thousand, twenty-one".