7985957851 has 2 divisors, whose sum is σ = 7985957852. Its totient is φ = 7985957850.

The previous prime is 7985957843. The next prime is 7985957873. The reversal of 7985957851 is 1587595897.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7985957851 - 2³ = 7985957843 is a prime.

It is not a weakly prime, because it can be changed into another prime (7985937851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3992978925 + 3992978926.

It is an arithmetic number, because the mean of its divisors is an integer number (3992978926).

Almost surely, 2^7985957851 is an apocalyptic number.

7985957851 is a deficient number, since it is larger than the sum of its proper divisors (1).

7985957851 is an equidigital number, since it uses as much as digits as its factorization.

7985957851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752000, while the sum is 64.

The square root of 7985957851 is about 89364.1866241729. The cubic root of 7985957851 is about 1998.8291355887.

The spelling of 7985957851 in words is "seven billion, nine hundred eighty-five million, nine hundred fifty-seven thousand, eight hundred fifty-one".