27651647197 has 2 divisors, whose sum is σ = 27651647198. Its totient is φ = 27651647196.

The previous prime is 27651647173. The next prime is 27651647263. The reversal of 27651647197 is 79174615672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18849642436 + 8802004761 = 137294^2 + 93819^2 .

It is a cyclic number.

It is not a de Polignac number, because 27651647197 - 2²⁷ = 27517429469 is a prime.

It is a super-2 number, since 2×27651647197² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27651647147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13825823598 + 13825823599.

It is an arithmetic number, because the mean of its divisors is an integer number (13825823599).

Almost surely, 2^27651647197 is an apocalyptic number.

It is an amenable number.

27651647197 is a deficient number, since it is larger than the sum of its proper divisors (1).

27651647197 is an equidigital number, since it uses as much as digits as its factorization.

27651647197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4445280, while the sum is 55.

The spelling of 27651647197 in words is "twenty-seven billion, six hundred fifty-one million, six hundred forty-seven thousand, one hundred ninety-seven".