2566605000 has 160 divisors (see below), whose sum is σ = 8056920960. Its totient is φ = 681120000.

The previous prime is 2566604993. The next prime is 2566605001. The reversal of 2566605000 is 5066652.

It is a super-2 number, since 2×2566605000² = 13174922452050000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566605001) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5954785 + ... + 5955215.

It is an arithmetic number, because the mean of its divisors is an integer number (50355756).

Almost surely, 2^2566605000 is an apocalyptic number.

2566605000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2566605000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4028460480).

2566605000 is an abundant number, since it is smaller than the sum of its proper divisors (5490315960).

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

2566605000 is a wasteful number, since it uses less digits than its factorization.

2566605000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857 (or 838 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 2566605000 is about 50661.6719029287. The cubic root of 2566605000 is about 1369.1562460452.

The spelling of 2566605000 in words is "two billion, five hundred sixty-six million, six hundred five thousand".