355561424681 has 2 divisors, whose sum is σ = 355561424682. Its totient is φ = 355561424680.

The previous prime is 355561424611. The next prime is 355561424689. The reversal of 355561424681 is 186424165553.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213914575081 + 141646849600 = 462509^2 + 376360^2 .

It is a cyclic number.

It is not a de Polignac number, because 355561424681 - 2³⁴ = 338381555497 is a prime.

It is a super-2 number, since 2×355561424681² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (355561424689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177780712340 + 177780712341.

It is an arithmetic number, because the mean of its divisors is an integer number (177780712341).

Almost surely, 2^355561424681 is an apocalyptic number.

It is an amenable number.

355561424681 is a deficient number, since it is larger than the sum of its proper divisors (1).

355561424681 is an equidigital number, since it uses as much as digits as its factorization.

355561424681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456000, while the sum is 50.

The spelling of 355561424681 in words is "three hundred fifty-five billion, five hundred sixty-one million, four hundred twenty-four thousand, six hundred eighty-one".