1664251429 has 2 divisors, whose sum is σ = 1664251430. Its totient is φ = 1664251428.

The previous prime is 1664251331. The next prime is 1664251481. The reversal of 1664251429 is 9241524661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1656327204 + 7924225 = 40698^2 + 2815^2 .

It is an emirp because it is prime and its reverse (9241524661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1664251429 - 2⁷ = 1664251301 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1664251391 and 1664251400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664251229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832125714 + 832125715.

It is an arithmetic number, because the mean of its divisors is an integer number (832125715).

Almost surely, 2^1664251429 is an apocalyptic number.

It is an amenable number.

1664251429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664251429 is an equidigital number, since it uses as much as digits as its factorization.

1664251429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 40.

The square root of 1664251429 is about 40795.2378225694. The cubic root of 1664251429 is about 1185.0581084456.

The spelling of 1664251429 in words is "one billion, six hundred sixty-four million, two hundred fifty-one thousand, four hundred twenty-nine".