207373783820681 has 4 divisors (see below), whose sum is σ = 211286496723012. Its totient is φ = 203461070918352.

The previous prime is 207373783820647. The next prime is 207373783820699. The reversal of 207373783820681 is 186028387373702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131249467565056 + 76124316255625 = 11456416^2 + 8724925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-207373783820681 is a prime.

It is a super-2 number, since 2×207373783820681² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (207373782820681) 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, 1956356451086 + ... + 1956356451191.

It is an arithmetic number, because the mean of its divisors is an integer number (52821624180753).

Almost surely, 2^{207373783820681} is an apocalyptic number.

It is an amenable number.

207373783820681 is a deficient number, since it is larger than the sum of its proper divisors (3912712902331).

207373783820681 is an equidigital number, since it uses as much as digits as its factorization.

207373783820681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3912712902330.

The product of its (nonzero) digits is 113799168, while the sum is 65.

The spelling of 207373783820681 in words is "two hundred seven trillion, three hundred seventy-three billion, seven hundred eighty-three million, eight hundred twenty thousand, six hundred eighty-one".