3565664451961 has 2 divisors, whose sum is σ = 3565664451962. Its totient is φ = 3565664451960.

The previous prime is 3565664451889. The next prime is 3565664451989. The reversal of 3565664451961 is 1691544665653.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2109916028025 + 1455748423936 = 1452555^2 + 1206544^2 .

It is an emirp because it is prime and its reverse (1691544665653) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3565664451961 - 2²¹ = 3565662354809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3565664451961.

It is not a weakly prime, because it can be changed into another prime (3565664431961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1782832225980 + 1782832225981.

It is an arithmetic number, because the mean of its divisors is an integer number (1782832225981).

Almost surely, 2^{3565664451961} is an apocalyptic number.

It is an amenable number.

3565664451961 is a deficient number, since it is larger than the sum of its proper divisors (1).

3565664451961 is an equidigital number, since it uses as much as digits as its factorization.

3565664451961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984000, while the sum is 61.

The spelling of 3565664451961 in words is "three trillion, five hundred sixty-five billion, six hundred sixty-four million, four hundred fifty-one thousand, nine hundred sixty-one".