781432280881 has 6 divisors (see below), whose sum is σ = 909013061490. Its totient is φ = 669799097856.

The previous prime is 781432280813. The next prime is 781432280917. The reversal of 781432280881 is 188082234187.

It can be written as a sum of positive squares in only one way, i.e., 556605523600 + 224826757281 = 746060^2 + 474159^2 .

It is not a de Polignac number, because 781432280881 - 2¹³ = 781432272689 is a prime.

It is a super-2 number, since 2×781432280881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (781432289881) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7973798736 + ... + 7973798833.

It is an arithmetic number, because the mean of its divisors is an integer number (151502176915).

Almost surely, 2^781432280881 is an apocalyptic number.

It is an amenable number.

781432280881 is a deficient number, since it is larger than the sum of its proper divisors (127580780609).

781432280881 is a wasteful number, since it uses less digits than its factorization.

781432280881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15947597583 (or 15947597576 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 52.

The spelling of 781432280881 in words is "seven hundred eighty-one billion, four hundred thirty-two million, two hundred eighty thousand, eight hundred eighty-one".