82601626581 has 8 divisors (see below), whose sum is σ = 122372780160. Its totient is φ = 55067751036.

The previous prime is 82601626577. The next prime is 82601626603. The reversal of 82601626581 is 18562610628.

82601626581 is a `hidden beast` number, since 8 + 2 + 6 + 0 + 1 + 62 + 6 + 581 = 666.

It is not a de Polignac number, because 82601626581 - 2² = 82601626577 is a prime.

It is a super-2 number, since 2×82601626581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82601626381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1529659725 + ... + 1529659778.

It is an arithmetic number, because the mean of its divisors is an integer number (15296597520).

Almost surely, 2^82601626581 is an apocalyptic number.

It is an amenable number.

82601626581 is a deficient number, since it is larger than the sum of its proper divisors (39771153579).

82601626581 is a wasteful number, since it uses less digits than its factorization.

82601626581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3059319512 (or 3059319506 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 82601626581 in words is "eighty-two billion, six hundred one million, six hundred twenty-six thousand, five hundred eighty-one".