207938665091 has 2 divisors, whose sum is σ = 207938665092. Its totient is φ = 207938665090.

The previous prime is 207938665061. The next prime is 207938665117. The reversal of 207938665091 is 190566839702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 207938665091 - 2²² = 207934470787 is a prime.

It is not a weakly prime, because it can be changed into another prime (207938665031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103969332545 + 103969332546.

It is an arithmetic number, because the mean of its divisors is an integer number (103969332546).

Almost surely, 2^207938665091 is an apocalyptic number.

207938665091 is a deficient number, since it is larger than the sum of its proper divisors (1).

207938665091 is an equidigital number, since it uses as much as digits as its factorization.

207938665091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4898880, while the sum is 56.

The spelling of 207938665091 in words is "two hundred seven billion, nine hundred thirty-eight million, six hundred sixty-five thousand, ninety-one".