6998778995 has 8 divisors (see below), whose sum is σ = 9044576016. Its totient is φ = 5168329056.

The previous prime is 6998778959. The next prime is 6998779019. The reversal of 6998778995 is 5998778996.

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

It is a cyclic number.

It is not a de Polignac number, because 6998778995 - 2⁶ = 6998778931 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53836697 + ... + 53836826.

It is an arithmetic number, because the mean of its divisors is an integer number (1130572002).

Almost surely, 2^6998778995 is an apocalyptic number.

6998778995 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

6998778995 is a deficient number, since it is larger than the sum of its proper divisors (2045797021).

6998778995 is a wasteful number, since it uses less digits than its factorization.

6998778995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107673541.

The product of its digits is 617258880, while the sum is 77.

The square root of 6998778995 is about 83658.7054346408. The cubic root of 6998778995 is about 1912.8199525649.

Subtracting from 6998778995 its reverse (5998778996), we obtain a palindrome (999999999).

The spelling of 6998778995 in words is "six billion, nine hundred ninety-eight million, seven hundred seventy-eight thousand, nine hundred ninety-five".