1968251009897 has 4 divisors (see below), whose sum is σ = 1980036944256. Its totient is φ = 1956465075540.

The previous prime is 1968251009827. The next prime is 1968251009899. The reversal of 1968251009897 is 7989001528691.

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 1968251009897 - 2³⁰ = 1967177268073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1968251009899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5892966929 + ... + 5892967262.

It is an arithmetic number, because the mean of its divisors is an integer number (495009236064).

Almost surely, 2^{1968251009897} is an apocalyptic number.

It is an amenable number.

1968251009897 is a deficient number, since it is larger than the sum of its proper divisors (11785934359).

1968251009897 is a wasteful number, since it uses less digits than its factorization.

1968251009897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11785934358.

The product of its (nonzero) digits is 19595520, while the sum is 65.

The spelling of 1968251009897 in words is "one trillion, nine hundred sixty-eight billion, two hundred fifty-one million, nine thousand, eight hundred ninety-seven".