427636257161 has 2 divisors, whose sum is σ = 427636257162. Its totient is φ = 427636257160.

The previous prime is 427636257131. The next prime is 427636257179. The reversal of 427636257161 is 161752636724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413249694025 + 14386563136 = 642845^2 + 119944^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-427636257161 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (427636257131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213818128580 + 213818128581.

It is an arithmetic number, because the mean of its divisors is an integer number (213818128581).

Almost surely, 2^427636257161 is an apocalyptic number.

It is an amenable number.

427636257161 is a deficient number, since it is larger than the sum of its proper divisors (1).

427636257161 is an equidigital number, since it uses as much as digits as its factorization.

427636257161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 50.

The spelling of 427636257161 in words is "four hundred twenty-seven billion, six hundred thirty-six million, two hundred fifty-seven thousand, one hundred sixty-one".