816420577850 has 12 divisors (see below), whose sum is σ = 1518542274894. Its totient is φ = 326568231120.

The previous prime is 816420577837. The next prime is 816420577859. The reversal of 816420577850 is 58775024618.

It can be written as a sum of positive squares in 3 ways, for example, as 661438997521 + 154981580329 = 813289^2 + 393677^2 .

It is a junction number, because it is equal to n+sod(n) for n = 816420577792 and 816420577801.

It is not an unprimeable number, because it can be changed into a prime (816420577859) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8164205729 + ... + 8164205828.

Almost surely, 2^816420577850 is an apocalyptic number.

816420577850 is a deficient number, since it is larger than the sum of its proper divisors (702121697044).

816420577850 is a wasteful number, since it uses less digits than its factorization.

816420577850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16328411569 (or 16328411564 counting only the distinct ones).

The product of its (nonzero) digits is 3763200, while the sum is 53.

The spelling of 816420577850 in words is "eight hundred sixteen billion, four hundred twenty million, five hundred seventy-seven thousand, eight hundred fifty".