355206660491 has 2 divisors, whose sum is σ = 355206660492. Its totient is φ = 355206660490.

The previous prime is 355206660469. The next prime is 355206660541. The reversal of 355206660491 is 194066602553.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-355206660491 is a prime.

It is a super-2 number, since 2×355206660491² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (355206660401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177603330245 + 177603330246.

It is an arithmetic number, because the mean of its divisors is an integer number (177603330246).

Almost surely, 2^355206660491 is an apocalyptic number.

355206660491 is a deficient number, since it is larger than the sum of its proper divisors (1).

355206660491 is an equidigital number, since it uses as much as digits as its factorization.

355206660491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1166400, while the sum is 47.

The spelling of 355206660491 in words is "three hundred fifty-five billion, two hundred six million, six hundred sixty thousand, four hundred ninety-one".