8255661620 has 12 divisors (see below), whose sum is σ = 17336889444. Its totient is φ = 3302264640.

The previous prime is 8255661599. The next prime is 8255661643. The reversal of 8255661620 is 261665528.

It can be written as a sum of positive squares in 2 ways, for example, as 3496593424 + 4759068196 = 59132^2 + 68986^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206391521 + ... + 206391560.

It is an arithmetic number, because the mean of its divisors is an integer number (1444740787).

Almost surely, 2^8255661620 is an apocalyptic number.

It is an amenable number.

8255661620 is an abundant number, since it is smaller than the sum of its proper divisors (9081227824).

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

8255661620 is a wasteful number, since it uses less digits than its factorization.

8255661620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412783090 (or 412783088 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 8255661620 is about 90860.6714701141. The cubic root of 8255661620 is about 2021.0821261389.

The spelling of 8255661620 in words is "eight billion, two hundred fifty-five million, six hundred sixty-one thousand, six hundred twenty".