405821854964 has 6 divisors (see below), whose sum is σ = 710188246194. Its totient is φ = 202910927480.

The previous prime is 405821854961. The next prime is 405821854967. The reversal of 405821854964 is 469458128504.

It is an interprime number because it is at equal distance from previous prime (405821854961) and next prime (405821854967).

It can be written as a sum of positive squares in only one way, i.e., 279320706064 + 126501148900 = 528508^2 + 355670^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405821854961) by changing a digit.

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 as a sum of consecutive naturals, namely, 50727731867 + ... + 50727731874.

It is an arithmetic number, because the mean of its divisors is an integer number (118364707699).

Almost surely, 2^405821854964 is an apocalyptic number.

It is an amenable number.

405821854964 is a deficient number, since it is larger than the sum of its proper divisors (304366391230).

405821854964 is a wasteful number, since it uses less digits than its factorization.

405821854964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101455463745 (or 101455463743 counting only the distinct ones).

The product of its (nonzero) digits is 11059200, while the sum is 56.

The spelling of 405821854964 in words is "four hundred five billion, eight hundred twenty-one million, eight hundred fifty-four thousand, nine hundred sixty-four".