78216253255 has 16 divisors (see below), whose sum is σ = 108869022720. Its totient is φ = 52833493152.

The previous prime is 78216253237. The next prime is 78216253303. The reversal of 78216253255 is 55235261287.

It is a cyclic number.

It is not a de Polignac number, because 78216253255 - 2²¹ = 78214156103 is a prime.

It is a super-2 number, since 2×78216253255² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16674895 + ... + 16679584.

It is an arithmetic number, because the mean of its divisors is an integer number (6804313920).

Almost surely, 2^78216253255 is an apocalyptic number.

78216253255 is a deficient number, since it is larger than the sum of its proper divisors (30652769465).

78216253255 is a wasteful number, since it uses less digits than its factorization.

78216253255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33354558.

The product of its digits is 1008000, while the sum is 46.

The spelling of 78216253255 in words is "seventy-eight billion, two hundred sixteen million, two hundred fifty-three thousand, two hundred fifty-five".