78889533451 has 2 divisors, whose sum is σ = 78889533452. Its totient is φ = 78889533450.

The previous prime is 78889533421. The next prime is 78889533533. The reversal of 78889533451 is 15433598887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78889533451 - 2¹¹ = 78889531403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78889533451.

It is not a weakly prime, because it can be changed into another prime (78889533421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39444766725 + 39444766726.

It is an arithmetic number, because the mean of its divisors is an integer number (39444766726).

Almost surely, 2^78889533451 is an apocalyptic number.

78889533451 is a deficient number, since it is larger than the sum of its proper divisors (1).

78889533451 is an equidigital number, since it uses as much as digits as its factorization.

78889533451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29030400, while the sum is 61.

The spelling of 78889533451 in words is "seventy-eight billion, eight hundred eighty-nine million, five hundred thirty-three thousand, four hundred fifty-one".