1971867781226 has 8 divisors (see below), whose sum is σ = 3380344767840. Its totient is φ = 845086191948.

The previous prime is 1971867781211. The next prime is 1971867781291. The reversal of 1971867781226 is 6221877681791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70423849316 + ... + 70423849343.

It is an arithmetic number, because the mean of its divisors is an integer number (422543095980).

Almost surely, 2^{1971867781226} is an apocalyptic number.

1971867781226 is a deficient number, since it is larger than the sum of its proper divisors (1408476986614).

1971867781226 is a wasteful number, since it uses less digits than its factorization.

1971867781226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140847698668.

The product of its digits is 28449792, while the sum is 65.

The spelling of 1971867781226 in words is "one trillion, nine hundred seventy-one billion, eight hundred sixty-seven million, seven hundred eighty-one thousand, two hundred twenty-six".