820377530369 has 4 divisors (see below), whose sum is σ = 820407300096. Its totient is φ = 820347760644.

The previous prime is 820377530363. The next prime is 820377530477. The reversal of 820377530369 is 963035773028.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820377530369 is a prime.

It is a super-2 number, since 2×820377530369² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 820377530369.

It is not an unprimeable number, because it can be changed into a prime (820377530363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14843489 + ... + 14898654.

It is an arithmetic number, because the mean of its divisors is an integer number (205101825024).

Almost surely, 2^820377530369 is an apocalyptic number.

It is an amenable number.

820377530369 is a deficient number, since it is larger than the sum of its proper divisors (29769727).

820377530369 is a wasteful number, since it uses less digits than its factorization.

820377530369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29769726.

The product of its (nonzero) digits is 5715360, while the sum is 53.

The spelling of 820377530369 in words is "eight hundred twenty billion, three hundred seventy-seven million, five hundred thirty thousand, three hundred sixty-nine".