618822666 has 240 divisors, whose sum is σ = 1857224160. Its totient is φ = 151865280.

The previous prime is 618822649. The next prime is 618822671. The reversal of 618822666 is 666228816.

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 119 ways as a sum of consecutive naturals, for example, 1658856 + ... + 1659228.

It is an arithmetic number, because the mean of its divisors is an integer number (7738434).

Almost surely, 2^618822666 is an apocalyptic number.

618822666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 618822666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (928612080).

618822666 is an abundant number, since it is smaller than the sum of its proper divisors (1238401494).

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

618822666 is a wasteful number, since it uses less digits than its factorization.

618822666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 415 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 618822666 is about 24876.1465263413. The cubic root of 618822666 is about 852.1618171124.

The spelling of 618822666 in words is "six hundred eighteen million, eight hundred twenty-two thousand, six hundred sixty-six".