812558913140 has 24 divisors (see below), whose sum is σ = 1837633234920. Its totient is φ = 300021752448.

The previous prime is 812558913107. The next prime is 812558913167. The reversal of 812558913140 is 41319855218.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15319396 + 812543593744 = 3914^2 + 901412^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1562613035 + ... + 1562613554.

It is an arithmetic number, because the mean of its divisors is an integer number (76568051455).

Almost surely, 2^812558913140 is an apocalyptic number.

It is an amenable number.

812558913140 is an abundant number, since it is smaller than the sum of its proper divisors (1025074321780).

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

812558913140 is a wasteful number, since it uses less digits than its factorization.

812558913140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125226611 (or 3125226609 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 47.

The spelling of 812558913140 in words is "eight hundred twelve billion, five hundred fifty-eight million, nine hundred thirteen thousand, one hundred forty".