7919948857 has 4 divisors (see below), whose sum is σ = 7928643456. Its totient is φ = 7911254260.

The previous prime is 7919948837. The next prime is 7919948867. The reversal of 7919948857 is 7588499197.

7919948857 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7919948857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7919948792 and 7919948801.

It is not an unprimeable number, because it can be changed into a prime (7919948837) 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, 4345933 + ... + 4347754.

It is an arithmetic number, because the mean of its divisors is an integer number (1982160864).

Almost surely, 2^7919948857 is an apocalyptic number.

It is an amenable number.

7919948857 is a deficient number, since it is larger than the sum of its proper divisors (8694599).

7919948857 is an equidigital number, since it uses as much as digits as its factorization.

7919948857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8694598.

The product of its digits is 45722880, while the sum is 67.

The square root of 7919948857 is about 88994.0945063210. The cubic root of 7919948857 is about 1993.3066962476.

The spelling of 7919948857 in words is "seven billion, nine hundred nineteen million, nine hundred forty-eight thousand, eight hundred fifty-seven".