2661775830 has 128 divisors (see below), whose sum is σ = 8212700160. Its totient is φ = 608370912.

The previous prime is 2661775813. The next prime is 2661775861. The reversal of 2661775830 is 385771662.

2661775830 is a `hidden beast` number, since 2 + 6 + 61 + 7 + 7 + 583 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 144397 + ... + 161783.

It is an arithmetic number, because the mean of its divisors is an integer number (64161720).

Almost surely, 2^2661775830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2661775830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4106350080).

2661775830 is an abundant number, since it is smaller than the sum of its proper divisors (5550924330).

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

2661775830 is an equidigital number, since it uses as much as digits as its factorization.

2661775830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17422 (or 17404 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 2661775830 is about 51592.4008939301. The cubic root of 2661775830 is about 1385.8742506929.

The spelling of 2661775830 in words is "two billion, six hundred sixty-one million, seven hundred seventy-five thousand, eight hundred thirty".