71783078812761 has 16 divisors (see below), whose sum is σ = 101199966371840. Its totient is φ = 45133377843600.

The previous prime is 71783078812741. The next prime is 71783078812769. The reversal of 71783078812761 is 16721887038717.

It is a happy number.

It is not a de Polignac number, because 71783078812761 - 2²⁹ = 71782541941849 is a prime.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71783078812692 and 71783078812701.

It is not an unprimeable number, because it can be changed into a prime (71783078812769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2823647065 + ... + 2823672486.

It is an arithmetic number, because the mean of its divisors is an integer number (6324997898240).

Almost surely, 2^{71783078812761} is an apocalyptic number.

It is an amenable number.

71783078812761 is a deficient number, since it is larger than the sum of its proper divisors (29416887559079).

71783078812761 is a wasteful number, since it uses less digits than its factorization.

71783078812761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5647319796.

The product of its (nonzero) digits is 44255232, while the sum is 66.

The spelling of 71783078812761 in words is "seventy-one trillion, seven hundred eighty-three billion, seventy-eight million, eight hundred twelve thousand, seven hundred sixty-one".