349778671365553 has 2 divisors, whose sum is σ = 349778671365554. Its totient is φ = 349778671365552.

The previous prime is 349778671365551. The next prime is 349778671365559. The reversal of 349778671365553 is 355563176877943.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310276528750224 + 39502142615329 = 17614668^2 + 6285073^2 .

It is a cyclic number.

It is not a de Polignac number, because 349778671365553 - 2¹ = 349778671365551 is a prime.

Together with 349778671365551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (349778671365551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174889335682776 + 174889335682777.

It is an arithmetic number, because the mean of its divisors is an integer number (174889335682777).

Almost surely, 2^{349778671365553} is an apocalyptic number.

It is an amenable number.

349778671365553 is a deficient number, since it is larger than the sum of its proper divisors (1).

349778671365553 is an equidigital number, since it uses as much as digits as its factorization.

349778671365553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12002256000, while the sum is 79.

The spelling of 349778671365553 in words is "three hundred forty-nine trillion, seven hundred seventy-eight billion, six hundred seventy-one million, three hundred sixty-five thousand, five hundred fifty-three".