991968750937 has 2 divisors, whose sum is σ = 991968750938. Its totient is φ = 991968750936.

The previous prime is 991968750923. The next prime is 991968750953. The reversal of 991968750937 is 739057869199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 883983561616 + 107985189321 = 940204^2 + 328611^2 .

It is a cyclic number.

It is not a de Polignac number, because 991968750937 - 2⁷ = 991968750809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 991968750937.

It is not a weakly prime, because it can be changed into another prime (991968751937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495984375468 + 495984375469.

It is an arithmetic number, because the mean of its divisors is an integer number (495984375469).

Almost surely, 2^991968750937 is an apocalyptic number.

It is an amenable number.

991968750937 is a deficient number, since it is larger than the sum of its proper divisors (1).

991968750937 is an equidigital number, since it uses as much as digits as its factorization.

991968750937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 231472080, while the sum is 73.

The spelling of 991968750937 in words is "nine hundred ninety-one billion, nine hundred sixty-eight million, seven hundred fifty thousand, nine hundred thirty-seven".