14678435857781 has 2 divisors, whose sum is σ = 14678435857782. Its totient is φ = 14678435857780.

The previous prime is 14678435857727. The next prime is 14678435857831. The reversal of 14678435857781 is 18775853487641.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13484803131556 + 1193632726225 = 3672166^2 + 1092535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-14678435857781 is a prime.

It is a super-2 number, since 2×14678435857781² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 14678435857699 and 14678435857708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (14678435856781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7339217928890 + 7339217928891.

It is an arithmetic number, because the mean of its divisors is an integer number (7339217928891).

Almost surely, 2^{14678435857781} is an apocalyptic number.

It is an amenable number.

14678435857781 is a deficient number, since it is larger than the sum of its proper divisors (1).

14678435857781 is an equidigital number, since it uses as much as digits as its factorization.

14678435857781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1264435200, while the sum is 74.

The spelling of 14678435857781 in words is "fourteen trillion, six hundred seventy-eight billion, four hundred thirty-five million, eight hundred fifty-seven thousand, seven hundred eighty-one".