207640419420691 has 4 divisors (see below), whose sum is σ = 207641601729000. Its totient is φ = 207639237112384.

The previous prime is 207640419420647. The next prime is 207640419420781. The reversal of 207640419420691 is 196024914046702.

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

It is a cyclic number.

It is not a de Polignac number, because 207640419420691 - 2³³ = 207631829486099 is a prime.

It is a super-2 number, since 2×207640419420691² (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 (207640419420601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590890681 + ... + 591241978.

It is an arithmetic number, because the mean of its divisors is an integer number (51910400432250).

Almost surely, 2^{207640419420691} is an apocalyptic number.

207640419420691 is a deficient number, since it is larger than the sum of its proper divisors (1182308309).

207640419420691 is a wasteful number, since it uses less digits than its factorization.

207640419420691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182308308.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 207640419420691 in words is "two hundred seven trillion, six hundred forty billion, four hundred nineteen million, four hundred twenty thousand, six hundred ninety-one".