320561450015765 has 24 divisors (see below), whose sum is σ = 447481874824992. Its totient is φ = 219811473641760.

The previous prime is 320561450015759. The next prime is 320561450015773. The reversal of 320561450015765 is 567510054165023.

It is not a de Polignac number, because 320561450015765 - 2¹⁴ = 320561449999381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19789442 + ... + 32136348.

It is an arithmetic number, because the mean of its divisors is an integer number (18645078117708).

Almost surely, 2^{320561450015765} is an apocalyptic number.

320561450015765 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

320561450015765 is a deficient number, since it is larger than the sum of its proper divisors (126920424809227).

320561450015765 is a wasteful number, since it uses less digits than its factorization.

320561450015765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12452897 (or 12452890 counting only the distinct ones).

The product of its (nonzero) digits is 3780000, while the sum is 50.

The spelling of 320561450015765 in words is "three hundred twenty trillion, five hundred sixty-one billion, four hundred fifty million, fifteen thousand, seven hundred sixty-five".