82791408821 has 8 divisors (see below), whose sum is σ = 90364217088. Its totient is φ = 75226320000.

The previous prime is 82791408793. The next prime is 82791408883. The reversal of 82791408821 is 12880419728.

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-82791408821 is a prime.

It is a super-2 number, since 2×82791408821² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82791408821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82791402821) 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, 1907420 + ... + 1950341.

It is an arithmetic number, because the mean of its divisors is an integer number (11295527136).

Almost surely, 2^82791408821 is an apocalyptic number.

It is an amenable number.

82791408821 is a deficient number, since it is larger than the sum of its proper divisors (7572808267).

82791408821 is a wasteful number, since it uses less digits than its factorization.

82791408821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3859723.

The product of its (nonzero) digits is 516096, while the sum is 50.

The spelling of 82791408821 in words is "eighty-two billion, seven hundred ninety-one million, four hundred eight thousand, eight hundred twenty-one".