2661778330 has 16 divisors (see below), whose sum is σ = 4817970720. Its totient is φ = 1058762512.

The previous prime is 2661778283. The next prime is 2661778337. The reversal of 2661778330 is 338771662.

It is not an unprimeable number, because it can be changed into a prime (2661778337) 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 7 ways as a sum of consecutive naturals, for example, 741724 + ... + 745303.

It is an arithmetic number, because the mean of its divisors is an integer number (301123170).

Almost surely, 2^2661778330 is an apocalyptic number.

2661778330 is a deficient number, since it is larger than the sum of its proper divisors (2156192390).

2661778330 is a wasteful number, since it uses less digits than its factorization.

2661778330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487213.

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 2661778330 is about 51592.4251222987. The cubic root of 2661778330 is about 1385.8746845742.

The spelling of 2661778330 in words is "two billion, six hundred sixty-one million, seven hundred seventy-eight thousand, three hundred thirty".