991968750938 has 8 divisors (see below), whose sum is σ = 1623221592480. Its totient is φ = 450894886780.

The previous prime is 991968750937. The next prime is 991968750953. The reversal of 991968750938 is 839057869199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (991968750937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22544744318 + ... + 22544744361.

It is an arithmetic number, because the mean of its divisors is an integer number (202902699060).

Almost surely, 2^991968750938 is an apocalyptic number.

991968750938 is a deficient number, since it is larger than the sum of its proper divisors (631252841542).

991968750938 is a wasteful number, since it uses less digits than its factorization.

991968750938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45089488692.

The product of its (nonzero) digits is 264539520, while the sum is 74.

The spelling of 991968750938 in words is "nine hundred ninety-one billion, nine hundred sixty-eight million, seven hundred fifty thousand, nine hundred thirty-eight".