781761132216 has 32 divisors (see below), whose sum is σ = 2171558701200. Its totient is φ = 260587044000.

The previous prime is 781761132199. The next prime is 781761132253. The reversal of 781761132216 is 612231167187.

781761132216 is a `hidden beast` number, since 7 + 8 + 1 + 7 + 611 + 3 + 2 + 21 + 6 = 666.

It is a super-3 number, since 3×781761132216³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1809632035 + ... + 1809632466.

Almost surely, 2^781761132216 is an apocalyptic number.

It is an amenable number.

781761132216 is an abundant number, since it is smaller than the sum of its proper divisors (1389797568984).

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

781761132216 is a wasteful number, since it uses less digits than its factorization.

781761132216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3619264516 (or 3619264506 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The spelling of 781761132216 in words is "seven hundred eighty-one billion, seven hundred sixty-one million, one hundred thirty-two thousand, two hundred sixteen".