20126497477 has 2 divisors, whose sum is σ = 20126497478. Its totient is φ = 20126497476.

The previous prime is 20126497463. The next prime is 20126497487. The reversal of 20126497477 is 77479462102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18552074436 + 1574423041 = 136206^2 + 39679^2 .

It is a cyclic number.

It is not a de Polignac number, because 20126497477 - 2²³ = 20118108869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20126497477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20126497487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10063248738 + 10063248739.

It is an arithmetic number, because the mean of its divisors is an integer number (10063248739).

Almost surely, 2^20126497477 is an apocalyptic number.

It is an amenable number.

20126497477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20126497477 is an equidigital number, since it uses as much as digits as its factorization.

20126497477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1185408, while the sum is 49.

The spelling of 20126497477 in words is "twenty billion, one hundred twenty-six million, four hundred ninety-seven thousand, four hundred seventy-seven".