6990195250081 has 2 divisors, whose sum is σ = 6990195250082. Its totient is φ = 6990195250080.

The previous prime is 6990195250037. The next prime is 6990195250133. The reversal of 6990195250081 is 1800525910996.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5426845134481 + 1563350115600 = 2329559^2 + 1250340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6990195250081 is a prime.

It is a super-2 number, since 2×6990195250081² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6990195250481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495097625040 + 3495097625041.

It is an arithmetic number, because the mean of its divisors is an integer number (3495097625041).

Almost surely, 2^{6990195250081} is an apocalyptic number.

It is an amenable number.

6990195250081 is a deficient number, since it is larger than the sum of its proper divisors (1).

6990195250081 is an equidigital number, since it uses as much as digits as its factorization.

6990195250081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1749600, while the sum is 55.

The spelling of 6990195250081 in words is "six trillion, nine hundred ninety billion, one hundred ninety-five million, two hundred fifty thousand, eighty-one".