65815634412 has 72 divisors (see below), whose sum is σ = 181880741952. Its totient is φ = 19901368800.

The previous prime is 65815634377. The next prime is 65815634449. The reversal of 65815634412 is 21443651856.

65815634412 is a `hidden beast` number, since 6 + 5 + 8 + 1 + 5 + 634 + 4 + 1 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6987 + ... + 362877.

It is an arithmetic number, because the mean of its divisors is an integer number (2526121416).

Almost surely, 2^65815634412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65815634412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90940370976).

65815634412 is an abundant number, since it is smaller than the sum of its proper divisors (116065107540).

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

65815634412 is a wasteful number, since it uses less digits than its factorization.

65815634412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356379 (or 356374 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The spelling of 65815634412 in words is "sixty-five billion, eight hundred fifteen million, six hundred thirty-four thousand, four hundred twelve".