1968150657571 has 4 divisors (see below), whose sum is σ = 2249315037232. Its totient is φ = 1686986277912.

The previous prime is 1968150657569. The next prime is 1968150657601. The reversal of 1968150657571 is 1757560518691.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1968150657571 - 2¹ = 1968150657569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1968150657971) 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, 140582189820 + ... + 140582189833.

It is an arithmetic number, because the mean of its divisors is an integer number (562328759308).

Almost surely, 2^{1968150657571} is an apocalyptic number.

1968150657571 is a deficient number, since it is larger than the sum of its proper divisors (281164379661).

1968150657571 is an equidigital number, since it uses as much as digits as its factorization.

1968150657571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281164379660.

The product of its (nonzero) digits is 15876000, while the sum is 61.

The spelling of 1968150657571 in words is "one trillion, nine hundred sixty-eight billion, one hundred fifty million, six hundred fifty-seven thousand, five hundred seventy-one".