66382821850 has 24 divisors (see below), whose sum is σ = 127455020928. Its totient is φ = 25696575600.

The previous prime is 66382821823. The next prime is 66382821863. The reversal of 66382821850 is 5812828366.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66382821794 and 66382821803.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21412264 + ... + 21415363.

It is an arithmetic number, because the mean of its divisors is an integer number (5310625872).

Almost surely, 2^66382821850 is an apocalyptic number.

66382821850 is a deficient number, since it is larger than the sum of its proper divisors (61072199078).

66382821850 is a wasteful number, since it uses less digits than its factorization.

66382821850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42827670 (or 42827665 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 49.

The spelling of 66382821850 in words is "sixty-six billion, three hundred eighty-two million, eight hundred twenty-one thousand, eight hundred fifty".