27800357149 has 2 divisors, whose sum is σ = 27800357150. Its totient is φ = 27800357148.

The previous prime is 27800357147. The next prime is 27800357183. The reversal of 27800357149 is 94175300872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21471040900 + 6329316249 = 146530^2 + 79557^2 .

It is a cyclic number.

It is not a de Polignac number, because 27800357149 - 2¹ = 27800357147 is a prime.

It is a super-2 number, since 2×27800357149² (a number of 22 digits) contains 22 as substring.

Together with 27800357147, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 27800357099 and 27800357108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27800357147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13900178574 + 13900178575.

It is an arithmetic number, because the mean of its divisors is an integer number (13900178575).

Almost surely, 2^27800357149 is an apocalyptic number.

It is an amenable number.

27800357149 is a deficient number, since it is larger than the sum of its proper divisors (1).

27800357149 is an equidigital number, since it uses as much as digits as its factorization.

27800357149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 27800357149 in words is "twenty-seven billion, eight hundred million, three hundred fifty-seven thousand, one hundred forty-nine".