8001668354561 has 16 divisors (see below), whose sum is σ = 9339707911680. Its totient is φ = 6712376524800.

The previous prime is 8001668354539. The next prime is 8001668354569. The reversal of 8001668354561 is 1654538661008.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8001668354561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8001668354569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7947725 + ... + 8897733.

It is an arithmetic number, because the mean of its divisors is an integer number (583731744480).

Almost surely, 2^{8001668354561} is an apocalyptic number.

It is an amenable number.

8001668354561 is a deficient number, since it is larger than the sum of its proper divisors (1338039557119).

8001668354561 is a wasteful number, since it uses less digits than its factorization.

8001668354561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975664.

The product of its (nonzero) digits is 4147200, while the sum is 53.

The spelling of 8001668354561 in words is "eight trillion, one billion, six hundred sixty-eight million, three hundred fifty-four thousand, five hundred sixty-one".