69840838656 has 140 divisors (see below), whose sum is σ = 208649530122. Its totient is φ = 23280058368.

The previous prime is 69840838633. The next prime is 69840838667. The reversal of 69840838656 is 65683804896.

It can be written as a sum of positive squares in only one way, i.e., 68685926400 + 1154912256 = 262080^2 + 33984^2 .

It is a junction number, because it is equal to n+sod(n) for n = 69840838593 and 69840838602.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 610926 + ... + 716178.

Almost surely, 2^69840838656 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 69840838656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104324765061).

69840838656 is an abundant number, since it is smaller than the sum of its proper divisors (138808691466).

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

69840838656 is an equidigital number, since it uses as much as digits as its factorization.

69840838656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105291 (or 105258 counting only the distinct ones).

The product of its (nonzero) digits is 59719680, while the sum is 63.

The spelling of 69840838656 in words is "sixty-nine billion, eight hundred forty million, eight hundred thirty-eight thousand, six hundred fifty-six".