1581422064401 has 2 divisors, whose sum is σ = 1581422064402. Its totient is φ = 1581422064400.

The previous prime is 1581422064371. The next prime is 1581422064419. The reversal of 1581422064401 is 1044602241851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1581419427025 + 2637376 = 1257545^2 + 1624^2 .

It is a cyclic number.

It is not a de Polignac number, because 1581422064401 - 2³⁰ = 1580348322577 is a prime.

It is not a weakly prime, because it can be changed into another prime (1581422064461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 790711032200 + 790711032201.

It is an arithmetic number, because the mean of its divisors is an integer number (790711032201).

Almost surely, 2^{1581422064401} is an apocalyptic number.

It is an amenable number.

1581422064401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1581422064401 is an equidigital number, since it uses as much as digits as its factorization.

1581422064401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61440, while the sum is 38.

The spelling of 1581422064401 in words is "one trillion, five hundred eighty-one billion, four hundred twenty-two million, sixty-four thousand, four hundred one".