6991017053 has 4 divisors (see below), whose sum is σ = 7002688800. Its totient is φ = 6979345308.

The previous prime is 6991017023. The next prime is 6991017067. The reversal of 6991017053 is 3507101996.

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 not a de Polignac number, because 6991017053 - 2⁸ = 6991016797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6991017053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991017023) 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, 5834975 + ... + 5836172.

It is an arithmetic number, because the mean of its divisors is an integer number (1750672200).

Almost surely, 2^6991017053 is an apocalyptic number.

It is an amenable number.

6991017053 is a deficient number, since it is larger than the sum of its proper divisors (11671747).

6991017053 is a wasteful number, since it uses less digits than its factorization.

6991017053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11671746.

The product of its (nonzero) digits is 51030, while the sum is 41.

The square root of 6991017053 is about 83612.3020434194. The cubic root of 6991017053 is about 1912.1125582396.

The spelling of 6991017053 in words is "six billion, nine hundred ninety-one million, seventeen thousand, fifty-three".