206432621425 has 6 divisors (see below), whose sum is σ = 255976450598. Its totient is φ = 165146097120.

The previous prime is 206432621407. The next prime is 206432621429. The reversal of 206432621425 is 524126234602.

It can be written as a sum of positive squares in 3 ways, for example, as 72100842256 + 134331779169 = 268516^2 + 366513^2 .

It is not a de Polignac number, because 206432621425 - 2¹⁵ = 206432588657 is a prime.

It is a super-2 number, since 2×206432621425² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206432621429) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 4128652404 + ... + 4128652453.

Almost surely, 2^206432621425 is an apocalyptic number.

206432621425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

206432621425 is a deficient number, since it is larger than the sum of its proper divisors (49543829173).

206432621425 is an equidigital number, since it uses as much as digits as its factorization.

206432621425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8257304867 (or 8257304862 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

The spelling of 206432621425 in words is "two hundred six billion, four hundred thirty-two million, six hundred twenty-one thousand, four hundred twenty-five".