1581422064409 has 4 divisors (see below), whose sum is σ = 1725187706640. Its totient is φ = 1437656422180.

The previous prime is 1581422064401. The next prime is 1581422064419. The reversal of 1581422064409 is 9044602241851.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1581422064409 - 2³ = 1581422064401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1581422064401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71882821099 + ... + 71882821120.

It is an arithmetic number, because the mean of its divisors is an integer number (431296926660).

Almost surely, 2^{1581422064409} is an apocalyptic number.

It is an amenable number.

1581422064409 is a deficient number, since it is larger than the sum of its proper divisors (143765642231).

1581422064409 is a wasteful number, since it uses less digits than its factorization.

1581422064409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143765642230.

The product of its (nonzero) digits is 552960, while the sum is 46.

The spelling of 1581422064409 in words is "one trillion, five hundred eighty-one billion, four hundred twenty-two million, sixty-four thousand, four hundred nine".