625516397 has 12 divisors (see below), whose sum is σ = 690035388. Its totient is φ = 566596800.

The previous prime is 625516363. The next prime is 625516403. The reversal of 625516397 is 793615526.

It can be written as a sum of positive squares in 2 ways, for example, as 503060041 + 122456356 = 22429^2 + 11066^2 .

It is not a de Polignac number, because 625516397 - 2²⁰ = 624467821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625516337) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24803 + ... + 43199.

It is an arithmetic number, because the mean of its divisors is an integer number (57502949).

Almost surely, 2^625516397 is an apocalyptic number.

It is an amenable number.

625516397 is a deficient number, since it is larger than the sum of its proper divisors (64518991).

625516397 is a wasteful number, since it uses less digits than its factorization.

625516397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18700 (or 18689 counting only the distinct ones).

The product of its digits is 340200, while the sum is 44.

The square root of 625516397 is about 25010.3258075540. The cubic root of 625516397 is about 855.2233822356.

The spelling of 625516397 in words is "six hundred twenty-five million, five hundred sixteen thousand, three hundred ninety-seven".