2257639566 has 96 divisors (see below), whose sum is σ = 5831170560. Its totient is φ = 569492352.

The previous prime is 2257639519. The next prime is 2257639583. The reversal of 2257639566 is 6659367522.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 156340 + ... + 170168.

It is an arithmetic number, because the mean of its divisors is an integer number (60741360).

Almost surely, 2^2257639566 is an apocalyptic number.

2257639566 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2257639566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2915585280).

2257639566 is an abundant number, since it is smaller than the sum of its proper divisors (3573530994).

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

2257639566 is a wasteful number, since it uses less digits than its factorization.

2257639566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13890 (or 13877 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 51.

The square root of 2257639566 is about 47514.6247591202. The cubic root of 2257639566 is about 1311.8520830014.

The spelling of 2257639566 in words is "two billion, two hundred fifty-seven million, six hundred thirty-nine thousand, five hundred sixty-six".