85651520617 has 4 divisors (see below), whose sum is σ = 92240099140. Its totient is φ = 79062942096.

The previous prime is 85651520569. The next prime is 85651520621. The reversal of 85651520617 is 71602515658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71602515658 = 2 ⋅35801257829.

It can be written as a sum of positive squares in 2 ways, for example, as 38257795216 + 47393725401 = 195596^2 + 217701^2 .

It is a cyclic number.

It is not a de Polignac number, because 85651520617 - 2¹¹ = 85651518569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85651520627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3294289242 + ... + 3294289267.

It is an arithmetic number, because the mean of its divisors is an integer number (23060024785).

Almost surely, 2^85651520617 is an apocalyptic number.

It is an amenable number.

85651520617 is a deficient number, since it is larger than the sum of its proper divisors (6588578523).

85651520617 is a wasteful number, since it uses less digits than its factorization.

85651520617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6588578522.

The product of its (nonzero) digits is 504000, while the sum is 46.

The spelling of 85651520617 in words is "eighty-five billion, six hundred fifty-one million, five hundred twenty thousand, six hundred seventeen".