1664224651 has 2 divisors, whose sum is σ = 1664224652. Its totient is φ = 1664224650.

The previous prime is 1664224643. The next prime is 1664224669. The reversal of 1664224651 is 1564224661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1664224651 - 2³ = 1664224643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1664224651.

It is not a weakly prime, because it can be changed into another prime (1664224691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832112325 + 832112326.

It is an arithmetic number, because the mean of its divisors is an integer number (832112326).

Almost surely, 2^1664224651 is an apocalyptic number.

1664224651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664224651 is an equidigital number, since it uses as much as digits as its factorization.

1664224651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 37.

The square root of 1664224651 is about 40794.9096211770. The cubic root of 1664224651 is about 1185.0517525037.

The spelling of 1664224651 in words is "one billion, six hundred sixty-four million, two hundred twenty-four thousand, six hundred fifty-one".