2534665561 has 2 divisors, whose sum is σ = 2534665562. Its totient is φ = 2534665560.

The previous prime is 2534665489. The next prime is 2534665571. The reversal of 2534665561 is 1655664352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2319867225 + 214798336 = 48165^2 + 14656^2 .

It is a cyclic number.

It is not a de Polignac number, because 2534665561 - 2⁷ = 2534665433 is a prime.

It is a super-2 number, since 2×2534665561² = 12849059012238889442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2534665571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1267332780 + 1267332781.

It is an arithmetic number, because the mean of its divisors is an integer number (1267332781).

Almost surely, 2^2534665561 is an apocalyptic number.

It is an amenable number.

2534665561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2534665561 is an equidigital number, since it uses as much as digits as its factorization.

2534665561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648000, while the sum is 43.

The square root of 2534665561 is about 50345.4621688986. The cubic root of 2534665561 is about 1363.4531554123.

The spelling of 2534665561 in words is "two billion, five hundred thirty-four million, six hundred sixty-five thousand, five hundred sixty-one".