78356889571 has 2 divisors, whose sum is σ = 78356889572. Its totient is φ = 78356889570.

The previous prime is 78356889551. The next prime is 78356889607. The reversal of 78356889571 is 17598865387.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78356889571 - 2²⁷ = 78222671843 is a prime.

It is a super-2 number, since 2×78356889571² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78356889497 and 78356889506.

It is not a weakly prime, because it can be changed into another prime (78356889551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39178444785 + 39178444786.

It is an arithmetic number, because the mean of its divisors is an integer number (39178444786).

Almost surely, 2^78356889571 is an apocalyptic number.

78356889571 is a deficient number, since it is larger than the sum of its proper divisors (1).

78356889571 is an equidigital number, since it uses as much as digits as its factorization.

78356889571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 101606400, while the sum is 67.

The spelling of 78356889571 in words is "seventy-eight billion, three hundred fifty-six million, eight hundred eighty-nine thousand, five hundred seventy-one".