786561668838 has 96 divisors (see below), whose sum is σ = 1890028183680. Its totient is φ = 234424817280.

The previous prime is 786561668833. The next prime is 786561668857. The reversal of 786561668838 is 838866165687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (786561668833) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2811306 + ... + 3078402.

It is an arithmetic number, because the mean of its divisors is an integer number (19687793580).

Almost surely, 2^786561668838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 786561668838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (945014091840).

786561668838 is an abundant number, since it is smaller than the sum of its proper divisors (1103466514842).

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

786561668838 is a wasteful number, since it uses less digits than its factorization.

786561668838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267362 (or 267359 counting only the distinct ones).

The product of its digits is 557383680, while the sum is 72.

The spelling of 786561668838 in words is "seven hundred eighty-six billion, five hundred sixty-one million, six hundred sixty-eight thousand, eight hundred thirty-eight".