625417163209 has 4 divisors (see below), whose sum is σ = 625435883140. Its totient is φ = 625398443280.

The previous prime is 625417163207. The next prime is 625417163221. The reversal of 625417163209 is 902361714526.

It is a happy number.

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 358363863225 + 267053299984 = 598635^2 + 516772^2 .

It is a cyclic number.

It is not a de Polignac number, because 625417163209 - 2¹ = 625417163207 is a prime.

It is a super-2 number, since 2×625417163209² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (625417163207) 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, 9309762 + ... + 9376699.

It is an arithmetic number, because the mean of its divisors is an integer number (156358970785).

Almost surely, 2^625417163209 is an apocalyptic number.

It is an amenable number.

625417163209 is a deficient number, since it is larger than the sum of its proper divisors (18719931).

625417163209 is a wasteful number, since it uses less digits than its factorization.

625417163209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18719930.

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 625417163209 in words is "six hundred twenty-five billion, four hundred seventeen million, one hundred sixty-three thousand, two hundred nine".