27306777661 has 2 divisors, whose sum is σ = 27306777662. Its totient is φ = 27306777660.

The previous prime is 27306777539. The next prime is 27306777671. The reversal of 27306777661 is 16677760372.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26526636900 + 780140761 = 162870^2 + 27931^2 .

It is a cyclic number.

It is not a de Polignac number, because 27306777661 - 2¹⁵ = 27306744893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27306777599 and 27306777608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27306777671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13653388830 + 13653388831.

It is an arithmetic number, because the mean of its divisors is an integer number (13653388831).

Almost surely, 2^27306777661 is an apocalyptic number.

It is an amenable number.

27306777661 is a deficient number, since it is larger than the sum of its proper divisors (1).

27306777661 is an equidigital number, since it uses as much as digits as its factorization.

27306777661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3111696, while the sum is 52.

The spelling of 27306777661 in words is "twenty-seven billion, three hundred six million, seven hundred seventy-seven thousand, six hundred sixty-one".