82772013581 has 4 divisors (see below), whose sum is σ = 82956361500. Its totient is φ = 82587665664.

The previous prime is 82772013547. The next prime is 82772013593. The reversal of 82772013581 is 18531027728.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26630976100 + 56141037481 = 163190^2 + 236941^2 .

It is a cyclic number.

It is not a de Polignac number, because 82772013581 - 2¹⁴ = 82771997197 is a prime.

It is a super-2 number, since 2×82772013581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82772013281) 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, 92173286 + ... + 92174183.

It is an arithmetic number, because the mean of its divisors is an integer number (20739090375).

Almost surely, 2^82772013581 is an apocalyptic number.

It is an amenable number.

82772013581 is a deficient number, since it is larger than the sum of its proper divisors (184347919).

82772013581 is a wasteful number, since it uses less digits than its factorization.

82772013581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184347918.

The product of its (nonzero) digits is 188160, while the sum is 44.

The spelling of 82772013581 in words is "eighty-two billion, seven hundred seventy-two million, thirteen thousand, five hundred eighty-one".