366566611622521 has 2 divisors, whose sum is σ = 366566611622522. Its totient is φ = 366566611622520.

The previous prime is 366566611622509. The next prime is 366566611622557. The reversal of 366566611622521 is 125226116665663.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225789240901225 + 140777370721296 = 15026285^2 + 11864964^2 .

It is a cyclic number.

It is not a de Polignac number, because 366566611622521 - 2⁵ = 366566611622489 is a prime.

It is a super-2 number, since 2×366566611622521² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (366566611622821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 183283305811260 + 183283305811261.

It is an arithmetic number, because the mean of its divisors is an integer number (183283305811261).

Almost surely, 2^{366566611622521} is an apocalyptic number.

It is an amenable number.

366566611622521 is a deficient number, since it is larger than the sum of its proper divisors (1).

366566611622521 is an equidigital number, since it uses as much as digits as its factorization.

366566611622521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27993600, while the sum is 58.

The spelling of 366566611622521 in words is "three hundred sixty-six trillion, five hundred sixty-six billion, six hundred eleven million, six hundred twenty-two thousand, five hundred twenty-one".