16071064561 has 2 divisors, whose sum is σ = 16071064562. Its totient is φ = 16071064560.

The previous prime is 16071064517. The next prime is 16071064577. The reversal of 16071064561 is 16546017061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16041742336 + 29322225 = 126656^2 + 5415^2 .

It is a cyclic number.

It is not a de Polignac number, because 16071064561 - 2⁹ = 16071064049 is a prime.

It is a super-2 number, since 2×16071064561² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16071064561.

It is not a weakly prime, because it can be changed into another prime (16071064591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8035532280 + 8035532281.

It is an arithmetic number, because the mean of its divisors is an integer number (8035532281).

Almost surely, 2^16071064561 is an apocalyptic number.

It is an amenable number.

16071064561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16071064561 is an equidigital number, since it uses as much as digits as its factorization.

16071064561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 16071064561 in words is "sixteen billion, seventy-one million, sixty-four thousand, five hundred sixty-one".