997941048866 has 4 divisors (see below), whose sum is σ = 1496911573302. Its totient is φ = 498970524432.

The previous prime is 997941048857. The next prime is 997941048877. The reversal of 997941048866 is 668840149799.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 975778474225 + 22162574641 = 987815^2 + 148871^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 997941048866.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249485262215 + ... + 249485262218.

Almost surely, 2^997941048866 is an apocalyptic number.

997941048866 is a deficient number, since it is larger than the sum of its proper divisors (498970524436).

997941048866 is a wasteful number, since it uses less digits than its factorization.

997941048866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498970524435.

The product of its (nonzero) digits is 188116992, while the sum is 71.

The spelling of 997941048866 in words is "nine hundred ninety-seven billion, nine hundred forty-one million, forty-eight thousand, eight hundred sixty-six".