126405916457 has 2 divisors, whose sum is σ = 126405916458. Its totient is φ = 126405916456.

The previous prime is 126405916409. The next prime is 126405916489. The reversal of 126405916457 is 754619504621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102312978496 + 24092937961 = 319864^2 + 155219^2 .

It is an emirp because it is prime and its reverse (754619504621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126405916457 - 2⁶ = 126405916393 is a prime.

It is not a weakly prime, because it can be changed into another prime (126405916157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63202958228 + 63202958229.

It is an arithmetic number, because the mean of its divisors is an integer number (63202958229).

Almost surely, 2^126405916457 is an apocalyptic number.

It is an amenable number.

126405916457 is a deficient number, since it is larger than the sum of its proper divisors (1).

126405916457 is an equidigital number, since it uses as much as digits as its factorization.

126405916457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 126405916457 in words is "one hundred twenty-six billion, four hundred five million, nine hundred sixteen thousand, four hundred fifty-seven".