997942211668 has 24 divisors (see below), whose sum is σ = 1800028790784. Its totient is φ = 483878690400.

The previous prime is 997942211641. The next prime is 997942211677. The reversal of 997942211668 is 866112249799.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28784980 + ... + 28819627.

It is an arithmetic number, because the mean of its divisors is an integer number (75001199616).

Almost surely, 2^997942211668 is an apocalyptic number.

It is an amenable number.

997942211668 is a deficient number, since it is larger than the sum of its proper divisors (802086579116).

997942211668 is a wasteful number, since it uses less digits than its factorization.

997942211668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57604743 (or 57604741 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 64.

The spelling of 997942211668 in words is "nine hundred ninety-seven billion, nine hundred forty-two million, two hundred eleven thousand, six hundred sixty-eight".