1425665691649 has 2 divisors, whose sum is σ = 1425665691650. Its totient is φ = 1425665691648.

The previous prime is 1425665691601. The next prime is 1425665691661. The reversal of 1425665691649 is 9461965665241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1046923915249 + 378741776400 = 1023193^2 + 615420^2 .

It is a cyclic number.

It is not a de Polignac number, because 1425665691649 - 2¹¹ = 1425665689601 is a prime.

It is not a weakly prime, because it can be changed into another prime (1425665691679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 712832845824 + 712832845825.

It is an arithmetic number, because the mean of its divisors is an integer number (712832845825).

Almost surely, 2^{1425665691649} is an apocalyptic number.

It is an amenable number.

1425665691649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1425665691649 is an equidigital number, since it uses as much as digits as its factorization.

1425665691649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 83980800, while the sum is 64.

The spelling of 1425665691649 in words is "one trillion, four hundred twenty-five billion, six hundred sixty-five million, six hundred ninety-one thousand, six hundred forty-nine".