1663928750129 has 4 divisors (see below), whose sum is σ = 1687364366400. Its totient is φ = 1640493133860.

The previous prime is 1663928750123. The next prime is 1663928750203. The reversal of 1663928750129 is 9210578293661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1663928750129 - 2³⁶ = 1595209273393 is a prime.

It is a super-2 number, since 2×1663928750129² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663928750123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11717808029 + ... + 11717808170.

It is an arithmetic number, because the mean of its divisors is an integer number (421841091600).

Almost surely, 2^{1663928750129} is an apocalyptic number.

It is an amenable number.

1663928750129 is a deficient number, since it is larger than the sum of its proper divisors (23435616271).

1663928750129 is an equidigital number, since it uses as much as digits as its factorization.

1663928750129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23435616270.

The product of its (nonzero) digits is 9797760, while the sum is 59.

The spelling of 1663928750129 in words is "one trillion, six hundred sixty-three billion, nine hundred twenty-eight million, seven hundred fifty thousand, one hundred twenty-nine".