207668367649 has 4 divisors (see below), whose sum is σ = 216697427136. Its totient is φ = 198639308164.

The previous prime is 207668367523. The next prime is 207668367667. The reversal of 207668367649 is 946763866702.

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 207668367649 - 2²³ = 207659979041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (207668367149) 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, 4514529709 + ... + 4514529754.

It is an arithmetic number, because the mean of its divisors is an integer number (54174356784).

Almost surely, 2^207668367649 is an apocalyptic number.

It is an amenable number.

207668367649 is a deficient number, since it is larger than the sum of its proper divisors (9029059487).

207668367649 is an equidigital number, since it uses as much as digits as its factorization.

207668367649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9029059486.

The product of its (nonzero) digits is 109734912, while the sum is 64.

The spelling of 207668367649 in words is "two hundred seven billion, six hundred sixty-eight million, three hundred sixty-seven thousand, six hundred forty-nine".