82651561691 has 8 divisors (see below), whose sum is σ = 82923918000. Its totient is φ = 82379409120.

The previous prime is 82651561669. The next prime is 82651561697. The reversal of 82651561691 is 19616515628.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82651561691 is a prime.

It is a super-2 number, since 2×82651561691² (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 (82651561697) 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, 784196 + ... + 883326.

It is an arithmetic number, because the mean of its divisors is an integer number (10365489750).

Almost surely, 2^82651561691 is an apocalyptic number.

82651561691 is a deficient number, since it is larger than the sum of its proper divisors (272356309).

82651561691 is a wasteful number, since it uses less digits than its factorization.

82651561691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101869.

The product of its digits is 777600, while the sum is 50.

The spelling of 82651561691 in words is "eighty-two billion, six hundred fifty-one million, five hundred sixty-one thousand, six hundred ninety-one".