7991800723 has 2 divisors, whose sum is σ = 7991800724. Its totient is φ = 7991800722.

The previous prime is 7991800717. The next prime is 7991800741. The reversal of 7991800723 is 3270081997.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7991800723 is a prime.

It is a super-2 number, since 2×7991800723² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7991800423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3995900361 + 3995900362.

It is an arithmetic number, because the mean of its divisors is an integer number (3995900362).

Almost surely, 2^7991800723 is an apocalyptic number.

7991800723 is a deficient number, since it is larger than the sum of its proper divisors (1).

7991800723 is an equidigital number, since it uses as much as digits as its factorization.

7991800723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 7991800723 is about 89396.8719978501. The cubic root of 7991800723 is about 1999.3164933526.

The spelling of 7991800723 in words is "seven billion, nine hundred ninety-one million, eight hundred thousand, seven hundred twenty-three".