17880178049 has 2 divisors, whose sum is σ = 17880178050. Its totient is φ = 17880178048.

The previous prime is 17880178037. The next prime is 17880178051. The reversal of 17880178049 is 94087108871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16729611649 + 1150566400 = 129343^2 + 33920^2 .

It is a cyclic number.

It is not a de Polignac number, because 17880178049 - 2⁴ = 17880178033 is a prime.

Together with 17880178051, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (17880172049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8940089024 + 8940089025.

It is an arithmetic number, because the mean of its divisors is an integer number (8940089025).

Almost surely, 2^17880178049 is an apocalyptic number.

It is an amenable number.

17880178049 is a deficient number, since it is larger than the sum of its proper divisors (1).

17880178049 is an equidigital number, since it uses as much as digits as its factorization.

17880178049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 903168, while the sum is 53.

The spelling of 17880178049 in words is "seventeen billion, eight hundred eighty million, one hundred seventy-eight thousand, forty-nine".