85820666447 has 2 divisors, whose sum is σ = 85820666448. Its totient is φ = 85820666446.

The previous prime is 85820666419. The next prime is 85820666473. The reversal of 85820666447 is 74466602858.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85820666447 - 2³⁴ = 68640797263 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 85820666392 and 85820666401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85820666747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42910333223 + 42910333224.

It is an arithmetic number, because the mean of its divisors is an integer number (42910333224).

Almost surely, 2^85820666447 is an apocalyptic number.

85820666447 is a deficient number, since it is larger than the sum of its proper divisors (1).

85820666447 is an equidigital number, since it uses as much as digits as its factorization.

85820666447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15482880, while the sum is 56.

The spelling of 85820666447 in words is "eighty-five billion, eight hundred twenty million, six hundred sixty-six thousand, four hundred forty-seven".