27697506813 has 12 divisors (see below), whose sum is σ = 40110361980. Its totient is φ = 18417534336.

The previous prime is 27697506787. The next prime is 27697506839. The reversal of 27697506813 is 31860579672.

It is an interprime number because it is at equal distance from previous prime (27697506787) and next prime (27697506839).

It can be written as a sum of positive squares in 2 ways, for example, as 20028476484 + 7669030329 = 141522^2 + 87573^2 .

It is not a de Polignac number, because 27697506813 - 2¹⁰ = 27697505789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27697506813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27697506713) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3952156 + ... + 3959157.

It is an arithmetic number, because the mean of its divisors is an integer number (3342530165).

Almost surely, 2^27697506813 is an apocalyptic number.

It is an amenable number.

27697506813 is a deficient number, since it is larger than the sum of its proper divisors (12412855167).

27697506813 is a wasteful number, since it uses less digits than its factorization.

27697506813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7911708 (or 7911705 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The spelling of 27697506813 in words is "twenty-seven billion, six hundred ninety-seven million, five hundred six thousand, eight hundred thirteen".