78472998281 has 2 divisors, whose sum is σ = 78472998282. Its totient is φ = 78472998280.

The previous prime is 78472998269. The next prime is 78472998299. The reversal of 78472998281 is 18289927487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53019667600 + 25453330681 = 230260^2 + 159541^2 .

It is a cyclic number.

It is not a de Polignac number, because 78472998281 - 2¹⁰ = 78472997257 is a prime.

It is a super-2 number, since 2×78472998281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78472998211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39236499140 + 39236499141.

It is an arithmetic number, because the mean of its divisors is an integer number (39236499141).

Almost surely, 2^78472998281 is an apocalyptic number.

It is an amenable number.

78472998281 is a deficient number, since it is larger than the sum of its proper divisors (1).

78472998281 is an equidigital number, since it uses as much as digits as its factorization.

78472998281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32514048, while the sum is 65.

The spelling of 78472998281 in words is "seventy-eight billion, four hundred seventy-two million, nine hundred ninety-eight thousand, two hundred eighty-one".