16621765615463 has 2 divisors, whose sum is σ = 16621765615464. Its totient is φ = 16621765615462.

The previous prime is 16621765615373. The next prime is 16621765615493. The reversal of 16621765615463 is 36451656712661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16621765615463 - 2⁸ = 16621765615207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16621765615493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8310882807731 + 8310882807732.

It is an arithmetic number, because the mean of its divisors is an integer number (8310882807732).

Almost surely, 2^{16621765615463} is an apocalyptic number.

16621765615463 is a deficient number, since it is larger than the sum of its proper divisors (1).

16621765615463 is an equidigital number, since it uses as much as digits as its factorization.

16621765615463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32659200, while the sum is 59.

The spelling of 16621765615463 in words is "sixteen trillion, six hundred twenty-one billion, seven hundred sixty-five million, six hundred fifteen thousand, four hundred sixty-three".