820379565842 has 8 divisors (see below), whose sum is σ = 1231600843836. Its totient is φ = 409845951232.

The previous prime is 820379565833. The next prime is 820379565899. The reversal of 820379565842 is 248565973028.

It can be written as a sum of positive squares in 2 ways, for example, as 759775465801 + 60604100041 = 871651^2 + 246179^2 .

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

It is a super-2 number, since 2×820379565842² (a number of 25 digits) contains 22 as substring.

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, 171912863 + ... + 171917634.

Almost surely, 2^820379565842 is an apocalyptic number.

820379565842 is a deficient number, since it is larger than the sum of its proper divisors (411221277994).

820379565842 is a wasteful number, since it uses less digits than its factorization.

820379565842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343831692.

The product of its (nonzero) digits is 29030400, while the sum is 59.

The spelling of 820379565842 in words is "eight hundred twenty billion, three hundred seventy-nine million, five hundred sixty-five thousand, eight hundred forty-two".