78375129261 has 48 divisors (see below), whose sum is σ = 124194208320. Its totient is φ = 43670880000.

The previous prime is 78375129221. The next prime is 78375129299. The reversal of 78375129261 is 16292157387.

It is not a de Polignac number, because 78375129261 - 2⁹ = 78375128749 is a prime.

It is a super-2 number, since 2×78375129261² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78375129221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1151385 + ... + 1217553.

It is an arithmetic number, because the mean of its divisors is an integer number (2587379340).

Almost surely, 2^78375129261 is an apocalyptic number.

It is an amenable number.

78375129261 is a deficient number, since it is larger than the sum of its proper divisors (45819079059).

78375129261 is a wasteful number, since it uses less digits than its factorization.

78375129261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66458 (or 66447 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 51.

The spelling of 78375129261 in words is "seventy-eight billion, three hundred seventy-five million, one hundred twenty-nine thousand, two hundred sixty-one".