620525661 has 12 divisors (see below), whose sum is σ = 962448192. Its totient is φ = 354586008.

The previous prime is 620525641. The next prime is 620525669. The reversal of 620525661 is 166525026.

It is a happy number.

It is not a de Polignac number, because 620525661 - 2⁵ = 620525629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620525669) 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 11 ways as a sum of consecutive naturals, for example, 2110485 + ... + 2110778.

It is an arithmetic number, because the mean of its divisors is an integer number (80204016).

Almost surely, 2^620525661 is an apocalyptic number.

It is an amenable number.

620525661 is a deficient number, since it is larger than the sum of its proper divisors (341922531).

620525661 is a wasteful number, since it uses less digits than its factorization.

620525661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4221280 (or 4221273 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 620525661 is about 24910.3524864663. The cubic root of 620525661 is about 852.9428152721.

The spelling of 620525661 in words is "six hundred twenty million, five hundred twenty-five thousand, six hundred sixty-one".