85082472721 has 3 divisors (see below), whose sum is σ = 85082764411. Its totient is φ = 85082181032.

The previous prime is 85082472677. The next prime is 85082472757. The reversal of 85082472721 is 12727428058.

It is a happy number.

The square root of 85082472721 is 291689.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 17295143121 + 67787329600 = 131511^2 + 260360^2 .

It is not a de Polignac number, because 85082472721 - 2¹¹ = 85082470673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85082472791) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 145845 + ... + 437533.

Almost surely, 2^85082472721 is an apocalyptic number.

85082472721 is the 291689-th square number.

85082472721 is the 145845-th centered octagonal number.

It is an amenable number.

85082472721 is a deficient number, since it is larger than the sum of its proper divisors (291690).

85082472721 is an frugal number, since it uses more digits than its factorization.

85082472721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583378 (or 291689 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 46.

The spelling of 85082472721 in words is "eighty-five billion, eighty-two million, four hundred seventy-two thousand, seven hundred twenty-one".