1997909934268 has 12 divisors (see below), whose sum is σ = 3648357271440. Its totient is φ = 955522142432.

The previous prime is 1997909934247. The next prime is 1997909934281. The reversal of 1997909934268 is 8624399097991.

It is a junction number, because it is equal to n+sod(n) for n = 1997909934194 and 1997909934203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10858206073 + ... + 10858206256.

It is an arithmetic number, because the mean of its divisors is an integer number (304029772620).

Almost surely, 2^{1997909934268} is an apocalyptic number.

It is an amenable number.

1997909934268 is a deficient number, since it is larger than the sum of its proper divisors (1650447337172).

1997909934268 is a wasteful number, since it uses less digits than its factorization.

1997909934268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21716412356 (or 21716412354 counting only the distinct ones).

The product of its (nonzero) digits is 476171136, while the sum is 76.

The spelling of 1997909934268 in words is "one trillion, nine hundred ninety-seven billion, nine hundred nine million, nine hundred thirty-four thousand, two hundred sixty-eight".