1425145661 has 2 divisors, whose sum is σ = 1425145662. Its totient is φ = 1425145660.

The previous prime is 1425145529. The next prime is 1425145663. The reversal of 1425145661 is 1665415241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1318416100 + 106729561 = 36310^2 + 10331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1425145661 is a prime.

Together with 1425145663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1425145663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 712572830 + 712572831.

It is an arithmetic number, because the mean of its divisors is an integer number (712572831).

Almost surely, 2^1425145661 is an apocalyptic number.

It is an amenable number.

1425145661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1425145661 is an equidigital number, since it uses as much as digits as its factorization.

1425145661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 35.

The square root of 1425145661 is about 37751.1014541298. The cubic root of 1425145661 is about 1125.3468983877.

The spelling of 1425145661 in words is "one billion, four hundred twenty-five million, one hundred forty-five thousand, six hundred sixty-one".