78918808281 has 16 divisors (see below), whose sum is σ = 107521717248. Its totient is φ = 51475533200.

The previous prime is 78918808277. The next prime is 78918808343. The reversal of 78918808281 is 18280881987.

It is a cyclic number.

It is not a de Polignac number, because 78918808281 - 2² = 78918808277 is a prime.

It is a super-2 number, since 2×78918808281² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78918808181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1386261 + ... + 1442066.

It is an arithmetic number, because the mean of its divisors is an integer number (6720107328).

Almost surely, 2^78918808281 is an apocalyptic number.

78918808281 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

78918808281 is a deficient number, since it is larger than the sum of its proper divisors (28602908967).

78918808281 is a wasteful number, since it uses less digits than its factorization.

78918808281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828532.

The product of its (nonzero) digits is 4128768, while the sum is 60.

The spelling of 78918808281 in words is "seventy-eight billion, nine hundred eighteen million, eight hundred eight thousand, two hundred eighty-one".