6620425956 has 81 divisors (see below), whose sum is σ = 17063323459. Its totient is φ = 2164335600.

The previous prime is 6620425951. The next prime is 6620425963. The reversal of 6620425956 is 6595240266.

It is a happy number.

The square root of 6620425956 is 81366.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6620425951) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 34661821 + ... + 34662011.

Almost surely, 2^6620425956 is an apocalyptic number.

6620425956 is the 81366-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6620425956

6620425956 is an abundant number, since it is smaller than the sum of its proper divisors (10442897503).

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

6620425956 is a wasteful number, since it uses less digits than its factorization.

6620425956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The cubic root of 6620425956 is about 1877.7105407087.

The spelling of 6620425956 in words is "six billion, six hundred twenty million, four hundred twenty-five thousand, nine hundred fifty-six".