27780053257 has 6 divisors (see below), whose sum is σ = 30535099994. Its totient is φ = 25254593760.

The previous prime is 27780053239. The next prime is 27780053267. The reversal of 27780053257 is 75235008772.

It can be written as a sum of positive squares in only one way, i.e., 22301240896 + 5478812361 = 149336^2 + 74019^2 .

It is not a de Polignac number, because 27780053257 - 2¹¹ = 27780051209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27780053267) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 114793488 + ... + 114793729.

Almost surely, 2^27780053257 is an apocalyptic number.

It is an amenable number.

27780053257 is a deficient number, since it is larger than the sum of its proper divisors (2755046737).

27780053257 is a wasteful number, since it uses less digits than its factorization.

27780053257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229587239 (or 229587228 counting only the distinct ones).

The product of its (nonzero) digits is 823200, while the sum is 46.

The spelling of 27780053257 in words is "twenty-seven billion, seven hundred eighty million, fifty-three thousand, two hundred fifty-seven".