6625404431 has 4 divisors (see below), whose sum is σ = 6656804664. Its totient is φ = 6594004200.

The previous prime is 6625404427. The next prime is 6625404437. The reversal of 6625404431 is 1344045266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1344045266 = 2 ⋅672022633.

It is a cyclic number.

It is not a de Polignac number, because 6625404431 - 2² = 6625404427 is a prime.

It is a super-2 number, since 2×6625404431² = 87791967748628867522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6625404391 and 6625404400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6625404437) 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, 15699800 + ... + 15700221.

It is an arithmetic number, because the mean of its divisors is an integer number (1664201166).

Almost surely, 2^6625404431 is an apocalyptic number.

6625404431 is a deficient number, since it is larger than the sum of its proper divisors (31400233).

6625404431 is a wasteful number, since it uses less digits than its factorization.

6625404431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31400232.

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 6625404431 is about 81396.5873424679. The cubic root of 6625404431 is about 1878.1810941544.

Adding to 6625404431 its reverse (1344045266), we get a palindrome (7969449697).

The spelling of 6625404431 in words is "six billion, six hundred twenty-five million, four hundred four thousand, four hundred thirty-one".