126966781651 has 2 divisors, whose sum is σ = 126966781652. Its totient is φ = 126966781650.

The previous prime is 126966781649. The next prime is 126966781763. The reversal of 126966781651 is 156187669621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 126966781651 - 2¹ = 126966781649 is a prime.

It is a super-2 number, since 2×126966781651² (a number of 23 digits) contains 22 as substring.

Together with 126966781649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (126966788651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63483390825 + 63483390826.

It is an arithmetic number, because the mean of its divisors is an integer number (63483390826).

Almost surely, 2^126966781651 is an apocalyptic number.

126966781651 is a deficient number, since it is larger than the sum of its proper divisors (1).

126966781651 is an equidigital number, since it uses as much as digits as its factorization.

126966781651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6531840, while the sum is 58.

The spelling of 126966781651 in words is "one hundred twenty-six billion, nine hundred sixty-six million, seven hundred eighty-one thousand, six hundred fifty-one".