82815512321 has 8 divisors (see below), whose sum is σ = 84898116864. Its totient is φ = 80740028880.

The previous prime is 82815512237. The next prime is 82815512323. The reversal of 82815512321 is 12321551828.

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-82815512321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82815512323) 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, 1756721 + ... + 1803246.

It is an arithmetic number, because the mean of its divisors is an integer number (10612264608).

Almost surely, 2^82815512321 is an apocalyptic number.

It is an amenable number.

82815512321 is a deficient number, since it is larger than the sum of its proper divisors (2082604543).

82815512321 is a wasteful number, since it uses less digits than its factorization.

82815512321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3560551.

The product of its digits is 38400, while the sum is 38.

The spelling of 82815512321 in words is "eighty-two billion, eight hundred fifteen million, five hundred twelve thousand, three hundred twenty-one".