6991203138165 has 48 divisors (see below), whose sum is σ = 12305535780096. Its totient is φ = 3671024227200.

The previous prime is 6991203138163. The next prime is 6991203138167. The reversal of 6991203138165 is 5618313021996.

6991203138165 is a `hidden beast` number, since 69 + 91 + 20 + 313 + 8 + 165 = 666.

It is an interprime number because it is at equal distance from previous prime (6991203138163) and next prime (6991203138167).

It is not a de Polignac number, because 6991203138165 - 2¹ = 6991203138163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991203138163) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5021395 + ... + 6260735.

It is an arithmetic number, because the mean of its divisors is an integer number (256365328752).

Almost surely, 2^{6991203138165} is an apocalyptic number.

It is an amenable number.

6991203138165 is a deficient number, since it is larger than the sum of its proper divisors (5314332641931).

6991203138165 is a wasteful number, since it uses less digits than its factorization.

6991203138165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241290 (or 1241287 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The spelling of 6991203138165 in words is "six trillion, nine hundred ninety-one billion, two hundred three million, one hundred thirty-eight thousand, one hundred sixty-five".