78338856261 has 8 divisors (see below), whose sum is σ = 104456278080. Its totient is φ = 52223669312.

The previous prime is 78338856217. The next prime is 78338856269. The reversal of 78338856261 is 16265883387.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78338856261 - 2⁷ = 78338856133 is a prime.

It is a super-2 number, since 2×78338856261² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78338856269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 475140 + ... + 618413.

It is an arithmetic number, because the mean of its divisors is an integer number (13057034760).

Almost surely, 2^78338856261 is an apocalyptic number.

It is an amenable number.

78338856261 is a deficient number, since it is larger than the sum of its proper divisors (26117421819).

78338856261 is a wasteful number, since it uses less digits than its factorization.

78338856261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117435.

The product of its digits is 11612160, while the sum is 57.

The spelling of 78338856261 in words is "seventy-eight billion, three hundred thirty-eight million, eight hundred fifty-six thousand, two hundred sixty-one".