16201216693 has 2 divisors, whose sum is σ = 16201216694. Its totient is φ = 16201216692.

The previous prime is 16201216613. The next prime is 16201216697. The reversal of 16201216693 is 39661210261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13669818724 + 2531397969 = 116918^2 + 50313^2 .

It is a cyclic number.

It is not a de Polignac number, because 16201216693 - 2¹³ = 16201208501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16201216697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8100608346 + 8100608347.

It is an arithmetic number, because the mean of its divisors is an integer number (8100608347).

Almost surely, 2^16201216693 is an apocalyptic number.

It is an amenable number.

16201216693 is a deficient number, since it is larger than the sum of its proper divisors (1).

16201216693 is an equidigital number, since it uses as much as digits as its factorization.

16201216693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

Subtracting from 16201216693 its sum of digits (37), we obtain a square (16201216656 = 127284²).

The spelling of 16201216693 in words is "sixteen billion, two hundred one million, two hundred sixteen thousand, six hundred ninety-three".