16623620408749 has 2 divisors, whose sum is σ = 16623620408750. Its totient is φ = 16623620408748.

The previous prime is 16623620408723. The next prime is 16623620408819. The reversal of 16623620408749 is 94780402632661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16603237135849 + 20383272900 = 4074707^2 + 142770^2 .

It is a cyclic number.

It is not a de Polignac number, because 16623620408749 - 2⁹ = 16623620408237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16623620408693 and 16623620408702.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16623620408719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8311810204374 + 8311810204375.

It is an arithmetic number, because the mean of its divisors is an integer number (8311810204375).

Almost surely, 2^{16623620408749} is an apocalyptic number.

It is an amenable number.

16623620408749 is a deficient number, since it is larger than the sum of its proper divisors (1).

16623620408749 is an equidigital number, since it uses as much as digits as its factorization.

16623620408749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20901888, while the sum is 58.

The spelling of 16623620408749 in words is "sixteen trillion, six hundred twenty-three billion, six hundred twenty million, four hundred eight thousand, seven hundred forty-nine".