203878793449 has 2 divisors, whose sum is σ = 203878793450. Its totient is φ = 203878793448.

The previous prime is 203878793431. The next prime is 203878793453. The reversal of 203878793449 is 944397878302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196005425625 + 7873367824 = 442725^2 + 88732^2 .

It is a cyclic number.

It is not a de Polignac number, because 203878793449 - 2¹¹ = 203878791401 is a prime.

It is not a weakly prime, because it can be changed into another prime (203878793429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101939396724 + 101939396725.

It is an arithmetic number, because the mean of its divisors is an integer number (101939396725).

Almost surely, 2^203878793449 is an apocalyptic number.

It is an amenable number.

203878793449 is a deficient number, since it is larger than the sum of its proper divisors (1).

203878793449 is an equidigital number, since it uses as much as digits as its factorization.

203878793449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73156608, while the sum is 64.

The spelling of 203878793449 in words is "two hundred three billion, eight hundred seventy-eight million, seven hundred ninety-three thousand, four hundred forty-nine".