781161811416 has 144 divisors (see below), whose sum is σ = 2463781755240. Its totient is φ = 222942101760.

The previous prime is 781161811411. The next prime is 781161811543. The reversal of 781161811416 is 614118161187.

781161811416 is a `hidden beast` number, since 7 + 8 + 1 + 1 + 618 + 1 + 14 + 16 = 666.

It is a super-2 number, since 2×781161811416² (a number of 25 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781161811411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3077836 + ... + 3321956.

Almost surely, 2^781161811416 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 781161811416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1231890877620).

781161811416 is an abundant number, since it is smaller than the sum of its proper divisors (1682619943824).

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

781161811416 is a wasteful number, since it uses less digits than its factorization.

781161811416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245054 (or 245040 counting only the distinct ones).

The product of its digits is 64512, while the sum is 45.

The spelling of 781161811416 in words is "seven hundred eighty-one billion, one hundred sixty-one million, eight hundred eleven thousand, four hundred sixteen".