85724579261 has 4 divisors (see below), whose sum is σ = 85736560800. Its totient is φ = 85712597724.

The previous prime is 85724579257. The next prime is 85724579263. The reversal of 85724579261 is 16297542758.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85724579261 - 2² = 85724579257 is a prime.

It is a super-2 number, since 2×85724579261² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85724579197 and 85724579206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85724579263) 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, 5980031 + ... + 5994348.

It is an arithmetic number, because the mean of its divisors is an integer number (21434140200).

Almost surely, 2^85724579261 is an apocalyptic number.

It is an amenable number.

85724579261 is a deficient number, since it is larger than the sum of its proper divisors (11981539).

85724579261 is a wasteful number, since it uses less digits than its factorization.

85724579261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11981538.

The product of its digits is 8467200, while the sum is 56.

The spelling of 85724579261 in words is "eighty-five billion, seven hundred twenty-four million, five hundred seventy-nine thousand, two hundred sixty-one".