820470510512805 has 16 divisors (see below), whose sum is σ = 1312754268619584. Its totient is φ = 437583788340480.

The previous prime is 820470510512789. The next prime is 820470510512819. The reversal of 820470510512805 is 508215015074028.

It is not a de Polignac number, because 820470510512805 - 2⁴ = 820470510512789 is a prime.

It is a super-2 number, since 2×820470510512805² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16014319 + ... + 43559148.

It is an arithmetic number, because the mean of its divisors is an integer number (82047141788724).

Almost surely, 2^{820470510512805} is an apocalyptic number.

It is an amenable number.

820470510512805 is a deficient number, since it is larger than the sum of its proper divisors (492283758106779).

820470510512805 is a wasteful number, since it uses less digits than its factorization.

820470510512805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60491636.

The product of its (nonzero) digits is 896000, while the sum is 48.

The spelling of 820470510512805 in words is "eight hundred twenty trillion, four hundred seventy billion, five hundred ten million, five hundred twelve thousand, eight hundred five".