1312506066561 has 8 divisors (see below), whose sum is σ = 1750058997120. Its totient is φ = 874978590192.

The previous prime is 1312506066541. The next prime is 1312506066583. The reversal of 1312506066561 is 1656606052131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1312506066561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1312506066511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6242905 + ... + 6449718.

It is an arithmetic number, because the mean of its divisors is an integer number (218757374640).

Almost surely, 2^{1312506066561} is an apocalyptic number.

It is an amenable number.

1312506066561 is a deficient number, since it is larger than the sum of its proper divisors (437552930559).

1312506066561 is a wasteful number, since it uses less digits than its factorization.

1312506066561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12727095.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 1312506066561 in words is "one trillion, three hundred twelve billion, five hundred six million, sixty-six thousand, five hundred sixty-one".