1663457669 has 2 divisors, whose sum is σ = 1663457670. Its totient is φ = 1663457668.

The previous prime is 1663457659. The next prime is 1663457683. The reversal of 1663457669 is 9667543661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 981568900 + 681888769 = 31330^2 + 26113^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663457669 - 2⁸ = 1663457413 is a prime.

It is a super-2 number, since 2×1663457669² = 5534182833109827122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1663457669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1663457639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831728834 + 831728835.

It is an arithmetic number, because the mean of its divisors is an integer number (831728835).

Almost surely, 2^1663457669 is an apocalyptic number.

It is an amenable number.

1663457669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663457669 is an equidigital number, since it uses as much as digits as its factorization.

1663457669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 53.

The square root of 1663457669 is about 40785.5080757859. The cubic root of 1663457669 is about 1184.8696751167.

The spelling of 1663457669 in words is "one billion, six hundred sixty-three million, four hundred fifty-seven thousand, six hundred sixty-nine".