82801579121 has 4 divisors (see below), whose sum is σ = 83799188592. Its totient is φ = 81803969652.

The previous prime is 82801579109. The next prime is 82801579127. The reversal of 82801579121 is 12197510828.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82801579121 is a prime.

It is a super-2 number, since 2×82801579121² (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 (82801579127) 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, 498804611 + ... + 498804776.

It is an arithmetic number, because the mean of its divisors is an integer number (20949797148).

Almost surely, 2^82801579121 is an apocalyptic number.

It is an amenable number.

82801579121 is a deficient number, since it is larger than the sum of its proper divisors (997609471).

82801579121 is an equidigital number, since it uses as much as digits as its factorization.

82801579121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997609470.

The product of its (nonzero) digits is 80640, while the sum is 44.

The spelling of 82801579121 in words is "eighty-two billion, eight hundred one million, five hundred seventy-nine thousand, one hundred twenty-one".