207210320645 has 4 divisors (see below), whose sum is σ = 248652384780. Its totient is φ = 165768256512.

The previous prime is 207210320617. The next prime is 207210320687. The reversal of 207210320645 is 546023012702.

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 35693411329 + 171516909316 = 188927^2 + 414146^2 .

It is a cyclic number.

It is not a de Polignac number, because 207210320645 - 2⁸ = 207210320389 is a prime.

It is a super-2 number, since 2×207210320645² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20721032060 + ... + 20721032069.

It is an arithmetic number, because the mean of its divisors is an integer number (62163096195).

Almost surely, 2^207210320645 is an apocalyptic number.

It is an amenable number.

207210320645 is a deficient number, since it is larger than the sum of its proper divisors (41442064135).

207210320645 is an equidigital number, since it uses as much as digits as its factorization.

207210320645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41442064134.

The product of its (nonzero) digits is 20160, while the sum is 32.

The spelling of 207210320645 in words is "two hundred seven billion, two hundred ten million, three hundred twenty thousand, six hundred forty-five".