16240069561 has 2 divisors, whose sum is σ = 16240069562. Its totient is φ = 16240069560.

The previous prime is 16240069543. The next prime is 16240069577. The reversal of 16240069561 is 16596004261.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15676292025 + 563777536 = 125205^2 + 23744^2 .

It is a cyclic number.

It is not a de Polignac number, because 16240069561 - 2¹⁵ = 16240036793 is a prime.

It is a super-2 number, since 2×16240069561² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16240069511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8120034780 + 8120034781.

It is an arithmetic number, because the mean of its divisors is an integer number (8120034781).

Almost surely, 2^16240069561 is an apocalyptic number.

It is an amenable number.

16240069561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16240069561 is an equidigital number, since it uses as much as digits as its factorization.

16240069561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 16240069561 in words is "sixteen billion, two hundred forty million, sixty-nine thousand, five hundred sixty-one".