126263187691 has 2 divisors, whose sum is σ = 126263187692. Its totient is φ = 126263187690.

The previous prime is 126263187683. The next prime is 126263187733. The reversal of 126263187691 is 196781362621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 126263187691 - 2³ = 126263187683 is a prime.

It is a super-2 number, since 2×126263187691² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (126263187641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63131593845 + 63131593846.

It is an arithmetic number, because the mean of its divisors is an integer number (63131593846).

Almost surely, 2^126263187691 is an apocalyptic number.

126263187691 is a deficient number, since it is larger than the sum of its proper divisors (1).

126263187691 is an equidigital number, since it uses as much as digits as its factorization.

126263187691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The spelling of 126263187691 in words is "one hundred twenty-six billion, two hundred sixty-three million, one hundred eighty-seven thousand, six hundred ninety-one".