355220399993 has 2 divisors, whose sum is σ = 355220399994. Its totient is φ = 355220399992.

The previous prime is 355220399981. The next prime is 355220400023. The reversal of 355220399993 is 399993022553.

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., 280107679504 + 75112720489 = 529252^2 + 274067^2 .

It is a cyclic number.

It is not a de Polignac number, because 355220399993 - 2¹⁸ = 355220137849 is a prime.

It is not a weakly prime, because it can be changed into another prime (355220339993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177610199996 + 177610199997.

It is an arithmetic number, because the mean of its divisors is an integer number (177610199997).

Almost surely, 2^355220399993 is an apocalyptic number.

It is an amenable number.

355220399993 is a deficient number, since it is larger than the sum of its proper divisors (1).

355220399993 is an equidigital number, since it uses as much as digits as its factorization.

355220399993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17714700, while the sum is 59.

The spelling of 355220399993 in words is "three hundred fifty-five billion, two hundred twenty million, three hundred ninety-nine thousand, nine hundred ninety-three".