356165665561 has 2 divisors, whose sum is σ = 356165665562. Its totient is φ = 356165665560.

The previous prime is 356165665489. The next prime is 356165665649. The reversal of 356165665561 is 165566561653.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194674205961 + 161491459600 = 441219^2 + 401860^2 .

It is a cyclic number.

It is not a de Polignac number, because 356165665561 - 2¹⁹ = 356165141273 is a prime.

It is not a weakly prime, because it can be changed into another prime (356165660561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 178082832780 + 178082832781.

It is an arithmetic number, because the mean of its divisors is an integer number (178082832781).

Almost surely, 2^356165665561 is an apocalyptic number.

It is an amenable number.

356165665561 is a deficient number, since it is larger than the sum of its proper divisors (1).

356165665561 is an equidigital number, since it uses as much as digits as its factorization.

356165665561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580000, while the sum is 55.

The spelling of 356165665561 in words is "three hundred fifty-six billion, one hundred sixty-five million, six hundred sixty-five thousand, five hundred sixty-one".