625643649220 has 12 divisors (see below), whose sum is σ = 1313851663404. Its totient is φ = 250257459680.

The previous prime is 625643649209. The next prime is 625643649221. The reversal of 625643649220 is 22946346526.

It can be written as a sum of positive squares in 2 ways, for example, as 374546448004 + 251097201216 = 612002^2 + 501096^2 .

It is not an unprimeable number, because it can be changed into a prime (625643649221) 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 3 ways as a sum of consecutive naturals, for example, 15641091211 + ... + 15641091250.

It is an arithmetic number, because the mean of its divisors is an integer number (109487638617).

Almost surely, 2^625643649220 is an apocalyptic number.

It is an amenable number.

625643649220 is an abundant number, since it is smaller than the sum of its proper divisors (688208014184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

625643649220 is a wasteful number, since it uses less digits than its factorization.

625643649220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31282182470 (or 31282182468 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 49.

The spelling of 625643649220 in words is "six hundred twenty-five billion, six hundred forty-three million, six hundred forty-nine thousand, two hundred twenty".