4345678781 has 2 divisors, whose sum is σ = 4345678782. Its totient is φ = 4345678780.

The previous prime is 4345678763. The next prime is 4345678783. The reversal of 4345678781 is 1878765434.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4154962681 + 190716100 = 64459^2 + 13810^2 .

It is a cyclic number.

It is not a de Polignac number, because 4345678781 - 2⁶ = 4345678717 is a prime.

It is a super-2 number, since 2×4345678781² = 37769848135267291922, which contains 22 as substring.

Together with 4345678783, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4345678783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2172839390 + 2172839391.

It is an arithmetic number, because the mean of its divisors is an integer number (2172839391).

Almost surely, 2^4345678781 is an apocalyptic number.

It is an amenable number.

4345678781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4345678781 is an equidigital number, since it uses as much as digits as its factorization.

4345678781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4515840, while the sum is 53.

The square root of 4345678781 is about 65921.7625750404. The cubic root of 4345678781 is about 1631.8711848309.

The spelling of 4345678781 in words is "four billion, three hundred forty-five million, six hundred seventy-eight thousand, seven hundred eighty-one".