85212057709 has 2 divisors, whose sum is σ = 85212057710. Its totient is φ = 85212057708.

The previous prime is 85212057703. The next prime is 85212057727. The reversal of 85212057709 is 90775021258.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82255960809 + 2956096900 = 286803^2 + 54370^2 .

It is a cyclic number.

It is not a de Polignac number, because 85212057709 - 2²³ = 85203669101 is a prime.

It is a super-2 number, since 2×85212057709² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85212057703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42606028854 + 42606028855.

It is an arithmetic number, because the mean of its divisors is an integer number (42606028855).

Almost surely, 2^85212057709 is an apocalyptic number.

It is an amenable number.

85212057709 is a deficient number, since it is larger than the sum of its proper divisors (1).

85212057709 is an equidigital number, since it uses as much as digits as its factorization.

85212057709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 352800, while the sum is 46.

The spelling of 85212057709 in words is "eighty-five billion, two hundred twelve million, fifty-seven thousand, seven hundred nine".