20127535457 has 2 divisors, whose sum is σ = 20127535458. Its totient is φ = 20127535456.

The previous prime is 20127535409. The next prime is 20127535481. The reversal of 20127535457 is 75453572102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18473974561 + 1653560896 = 135919^2 + 40664^2 .

It is a cyclic number.

It is not a de Polignac number, because 20127535457 - 2¹⁰ = 20127534433 is a prime.

It is not a weakly prime, because it can be changed into another prime (20127535357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10063767728 + 10063767729.

It is an arithmetic number, because the mean of its divisors is an integer number (10063767729).

Almost surely, 2^20127535457 is an apocalyptic number.

It is an amenable number.

20127535457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20127535457 is an equidigital number, since it uses as much as digits as its factorization.

20127535457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 294000, while the sum is 41.

The spelling of 20127535457 in words is "twenty billion, one hundred twenty-seven million, five hundred thirty-five thousand, four hundred fifty-seven".