85723702681 has 4 divisors (see below), whose sum is σ = 86898000052. Its totient is φ = 84549405312.

The previous prime is 85723702657. The next prime is 85723702711. The reversal of 85723702681 is 18620732758.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18620732758 = 2 ⋅9310366379.

It can be written as a sum of positive squares in 2 ways, for example, as 38486592400 + 47237110281 = 196180^2 + 217341^2 .

It is a cyclic number.

It is not a de Polignac number, because 85723702681 - 2⁷ = 85723702553 is a prime.

It is a super-2 number, since 2×85723702681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85723702601) 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, 587148576 + ... + 587148721.

It is an arithmetic number, because the mean of its divisors is an integer number (21724500013).

Almost surely, 2^85723702681 is an apocalyptic number.

It is an amenable number.

85723702681 is a deficient number, since it is larger than the sum of its proper divisors (1174297371).

85723702681 is a wasteful number, since it uses less digits than its factorization.

85723702681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174297370.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 85723702681 in words is "eighty-five billion, seven hundred twenty-three million, seven hundred two thousand, six hundred eighty-one".