971643509950 has 12 divisors (see below), whose sum is σ = 1807256928600. Its totient is φ = 388657403960.

The previous prime is 971643509939. The next prime is 971643509959. The reversal of 971643509950 is 59905346179.

It is a happy number.

It is a super-2 number, since 2×971643509950² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971643509959) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9716435050 + ... + 9716435149.

It is an arithmetic number, because the mean of its divisors is an integer number (150604744050).

Almost surely, 2^971643509950 is an apocalyptic number.

971643509950 is a deficient number, since it is larger than the sum of its proper divisors (835613418650).

971643509950 is a wasteful number, since it uses less digits than its factorization.

971643509950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19432870211 (or 19432870206 counting only the distinct ones).

The product of its (nonzero) digits is 9185400, while the sum is 58.

The spelling of 971643509950 in words is "nine hundred seventy-one billion, six hundred forty-three million, five hundred nine thousand, nine hundred fifty".