78129247511 has 24 divisors (see below), whose sum is σ = 91260702720. Its totient is φ = 66691667952.

The previous prime is 78129247477. The next prime is 78129247519. The reversal of 78129247511 is 11574292187.

It is not a de Polignac number, because 78129247511 - 2¹⁰ = 78129246487 is a prime.

It is a super-2 number, since 2×78129247511² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78129247519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14797370 + ... + 14802648.

It is an arithmetic number, because the mean of its divisors is an integer number (3802529280).

Almost surely, 2^78129247511 is an apocalyptic number.

78129247511 is a deficient number, since it is larger than the sum of its proper divisors (13131455209).

78129247511 is a wasteful number, since it uses less digits than its factorization.

78129247511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6483 (or 6476 counting only the distinct ones).

The product of its digits is 282240, while the sum is 47.

The spelling of 78129247511 in words is "seventy-eight billion, one hundred twenty-nine million, two hundred forty-seven thousand, five hundred eleven".