19977543969268 has 12 divisors (see below), whose sum is σ = 35048764170532. Its totient is φ = 9963611349120.

The previous prime is 19977543969247. The next prime is 19977543969277. The reversal of 19977543969268 is 86296934577991.

It can be written as a sum of positive squares in 2 ways, for example, as 4789672315024 + 15187871654244 = 2188532^2 + 3897162^2 .

It is a congruent 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, 6290157093 + ... + 6290160268.

Almost surely, 2^{19977543969268} is an apocalyptic number.

It is an amenable number.

19977543969268 is a deficient number, since it is larger than the sum of its proper divisors (15071220201264).

19977543969268 is a wasteful number, since it uses less digits than its factorization.

19977543969268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12580317762 (or 12580317760 counting only the distinct ones).

The product of its digits is 11110659840, while the sum is 85.

The spelling of 19977543969268 in words is "nineteen trillion, nine hundred seventy-seven billion, five hundred forty-three million, nine hundred sixty-nine thousand, two hundred sixty-eight".