1601321318864 has 40 divisors (see below), whose sum is σ = 3156347305248. Its totient is φ = 786836856960.

The previous prime is 1601321318833. The next prime is 1601321318869. The reversal of 1601321318864 is 4688131231061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601321318869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1322762 + ... + 2225385.

Almost surely, 2^{1601321318864} is an apocalyptic number.

It is an amenable number.

1601321318864 is a deficient number, since it is larger than the sum of its proper divisors (1555025986384).

1601321318864 is a wasteful number, since it uses less digits than its factorization.

1601321318864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3548643 (or 3548637 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 1601321318864 in words is "one trillion, six hundred one billion, three hundred twenty-one million, three hundred eighteen thousand, eight hundred sixty-four".