27238825661 has 2 divisors, whose sum is σ = 27238825662. Its totient is φ = 27238825660.

The previous prime is 27238825651. The next prime is 27238825699. The reversal of 27238825661 is 16652883272.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26763324025 + 475501636 = 163595^2 + 21806^2 .

It is a cyclic number.

It is not a de Polignac number, because 27238825661 - 2⁶ = 27238825597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27238825651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13619412830 + 13619412831.

It is an arithmetic number, because the mean of its divisors is an integer number (13619412831).

Almost surely, 2^27238825661 is an apocalyptic number.

It is an amenable number.

27238825661 is a deficient number, since it is larger than the sum of its proper divisors (1).

27238825661 is an equidigital number, since it uses as much as digits as its factorization.

27238825661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 50.

The spelling of 27238825661 in words is "twenty-seven billion, two hundred thirty-eight million, eight hundred twenty-five thousand, six hundred sixty-one".