78881463636281 has 4 divisors (see below), whose sum is σ = 78968051412864. Its totient is φ = 78794875859700.

The previous prime is 78881463636259. The next prime is 78881463636307. The reversal of 78881463636281 is 18263636418887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78881463636281 - 2¹⁸ = 78881463374137 is a prime.

It is a super-2 number, since 2×78881463636281² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78881463636211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43293886925 + ... + 43293888746.

It is an arithmetic number, because the mean of its divisors is an integer number (19742012853216).

Almost surely, 2^{78881463636281} is an apocalyptic number.

It is an amenable number.

78881463636281 is a deficient number, since it is larger than the sum of its proper divisors (86587776583).

78881463636281 is an equidigital number, since it uses as much as digits as its factorization.

78881463636281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86587776582.

The product of its digits is 445906944, while the sum is 71.

The spelling of 78881463636281 in words is "seventy-eight trillion, eight hundred eighty-one billion, four hundred sixty-three million, six hundred thirty-six thousand, two hundred eighty-one".