9919750643 has 32 divisors (see below), whose sum is σ = 11464355520. Its totient is φ = 8501740800.

The previous prime is 9919750637. The next prime is 9919750703. The reversal of 9919750643 is 3460579199.

It is a happy number.

It is not a de Polignac number, because 9919750643 - 2⁸ = 9919750387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9919752643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72406871 + ... + 72407007.

It is an arithmetic number, because the mean of its divisors is an integer number (358261110).

Almost surely, 2^9919750643 is an apocalyptic number.

9919750643 is a deficient number, since it is larger than the sum of its proper divisors (1544604877).

9919750643 is an equidigital number, since it uses as much as digits as its factorization.

9919750643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 53.

The square root of 9919750643 is about 99597.9449737795. The cubic root of 9919750643 is about 2148.6561382337.

The spelling of 9919750643 in words is "nine billion, nine hundred nineteen million, seven hundred fifty thousand, six hundred forty-three".