4155320355521 has 2 divisors, whose sum is σ = 4155320355522. Its totient is φ = 4155320355520.

The previous prime is 4155320355497. The next prime is 4155320355539. The reversal of 4155320355521 is 1255530235514.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2762061183025 + 1393259172496 = 1661945^2 + 1180364^2 .

It is a cyclic number.

It is not a de Polignac number, because 4155320355521 - 2¹⁸ = 4155320093377 is a prime.

It is not a weakly prime, because it can be changed into another prime (4155320355541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2077660177760 + 2077660177761.

It is an arithmetic number, because the mean of its divisors is an integer number (2077660177761).

Almost surely, 2^{4155320355521} is an apocalyptic number.

It is an amenable number.

4155320355521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4155320355521 is an equidigital number, since it uses as much as digits as its factorization.

4155320355521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450000, while the sum is 41.

The spelling of 4155320355521 in words is "four trillion, one hundred fifty-five billion, three hundred twenty million, three hundred fifty-five thousand, five hundred twenty-one".