27750751261 has 4 divisors (see below), whose sum is σ = 29383148412. Its totient is φ = 26118354112.

The previous prime is 27750751247. The next prime is 27750751267. The reversal of 27750751261 is 16215705772.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24740144100 + 3010607161 = 157290^2 + 54869^2 .

It is a cyclic number.

It is not a de Polignac number, because 27750751261 - 2⁵ = 27750751229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27750751267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816198550 + ... + 816198583.

It is an arithmetic number, because the mean of its divisors is an integer number (7345787103).

Almost surely, 2^27750751261 is an apocalyptic number.

It is an amenable number.

27750751261 is a deficient number, since it is larger than the sum of its proper divisors (1632397151).

27750751261 is a wasteful number, since it uses less digits than its factorization.

27750751261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632397150.

The product of its (nonzero) digits is 205800, while the sum is 43.

The spelling of 27750751261 in words is "twenty-seven billion, seven hundred fifty million, seven hundred fifty-one thousand, two hundred sixty-one".