78116985261 has 36 divisors (see below), whose sum is σ = 131571367200. Its totient is φ = 44531636688.

The previous prime is 78116985239. The next prime is 78116985313. The reversal of 78116985261 is 16258961187.

It is a happy number.

It is not a de Polignac number, because 78116985261 - 2⁹ = 78116984749 is a prime.

It is a super-2 number, since 2×78116985261² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78116985198 and 78116985207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78116985361) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 26601 + ... + 396158.

It is an arithmetic number, because the mean of its divisors is an integer number (3654760200).

Almost surely, 2^78116985261 is an apocalyptic number.

It is an amenable number.

78116985261 is a deficient number, since it is larger than the sum of its proper divisors (53454381939).

78116985261 is a wasteful number, since it uses less digits than its factorization.

78116985261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423198 (or 423188 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 54.

The spelling of 78116985261 in words is "seventy-eight billion, one hundred sixteen million, nine hundred eighty-five thousand, two hundred sixty-one".