812830783545 has 320 divisors, whose sum is σ = 1707462789120. Its totient is φ = 365783040000.

The previous prime is 812830783543. The next prime is 812830783547. The reversal of 812830783545 is 545387038218.

812830783545 is a `hidden beast` number, since 8 + 1 + 28 + 3 + 0 + 78 + 3 + 545 = 666.

It is an interprime number because it is at equal distance from previous prime (812830783543) and next prime (812830783547).

It is not a de Polignac number, because 812830783545 - 2¹ = 812830783543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 812830783491 and 812830783500.

It is not an unprimeable number, because it can be changed into a prime (812830783543) by changing a digit.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 1268066425 + ... + 1268067065.

It is an arithmetic number, because the mean of its divisors is an integer number (5335821216).

Almost surely, 2^812830783545 is an apocalyptic number.

It is an amenable number.

812830783545 is an abundant number, since it is smaller than the sum of its proper divisors (894632005575).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

812830783545 is a wasteful number, since it uses less digits than its factorization.

812830783545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970 (or 961 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 54.

The spelling of 812830783545 in words is "eight hundred twelve billion, eight hundred thirty million, seven hundred eighty-three thousand, five hundred forty-five".