820540256366 has 8 divisors (see below), whose sum is σ = 1249180689000. Its totient is φ = 404146693368.

The previous prime is 820540256353. The next prime is 820540256387. The reversal of 820540256366 is 663652045028.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 820540256366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3061717241 + ... + 3061717508.

It is an arithmetic number, because the mean of its divisors is an integer number (156147586125).

Almost surely, 2^820540256366 is an apocalyptic number.

820540256366 is a deficient number, since it is larger than the sum of its proper divisors (428640432634).

820540256366 is a wasteful number, since it uses less digits than its factorization.

820540256366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6123434818.

The product of its (nonzero) digits is 2073600, while the sum is 47.

The spelling of 820540256366 in words is "eight hundred twenty billion, five hundred forty million, two hundred fifty-six thousand, three hundred sixty-six".