16765720663 has 4 divisors (see below), whose sum is σ = 17049885480. Its totient is φ = 16481555848.

The previous prime is 16765720567. The next prime is 16765720691. The reversal of 16765720663 is 36602756761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36602756761 = 23 ⋅1591424207.

It is a cyclic number.

It is not a de Polignac number, because 16765720663 - 2⁹ = 16765720151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16765720693) 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, 142082320 + ... + 142082437.

It is an arithmetic number, because the mean of its divisors is an integer number (4262471370).

Almost surely, 2^16765720663 is an apocalyptic number.

16765720663 is a deficient number, since it is larger than the sum of its proper divisors (284164817).

16765720663 is an equidigital number, since it uses as much as digits as its factorization.

16765720663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284164816.

The product of its (nonzero) digits is 1905120, while the sum is 49.

The spelling of 16765720663 in words is "sixteen billion, seven hundred sixty-five million, seven hundred twenty thousand, six hundred sixty-three".