85907070521 has 2 divisors, whose sum is σ = 85907070522. Its totient is φ = 85907070520.

The previous prime is 85907070407. The next prime is 85907070527. The reversal of 85907070521 is 12507070958.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58243064896 + 27664005625 = 241336^2 + 166325^2 .

It is a cyclic number.

It is not a de Polignac number, because 85907070521 - 2¹⁰ = 85907069497 is a prime.

It is a super-2 number, since 2×85907070521² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85907070527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42953535260 + 42953535261.

It is an arithmetic number, because the mean of its divisors is an integer number (42953535261).

Almost surely, 2^85907070521 is an apocalyptic number.

It is an amenable number.

85907070521 is a deficient number, since it is larger than the sum of its proper divisors (1).

85907070521 is an equidigital number, since it uses as much as digits as its factorization.

85907070521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 176400, while the sum is 44.

The spelling of 85907070521 in words is "eighty-five billion, nine hundred seven million, seventy thousand, five hundred twenty-one".