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81844270939199 = 612575220658987
BaseRepresentation
bin10010100110111111011010…
…101100100011110000111111
3101201210020100221222220202102
4102212333122230203300333
541211414031330023244
6450022423343215315
723145024221341106
oct2246773254436077
9351706327886672
1081844270939199
1124094a622a668a
129219b748a753b
133688b5cc42822
14162d3d8c5103d
1596de55dbc54e
hex4a6fdab23c3f

81844270939199 has 8 divisors (see below), whose sum is σ = 83509661172048. Its totient is φ = 80189322024960.

The previous prime is 81844270939169. The next prime is 81844270939219. The reversal of 81844270939199 is 99193907244818.

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

It is a cyclic number.

It is not a de Polignac number, because 81844270939199 - 212 = 81844270935103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81844270939169) 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, 2610313817 + ... + 2610345170.

It is an arithmetic number, because the mean of its divisors is an integer number (10438707646506).

Almost surely, 281844270939199 is an apocalyptic number.

81844270939199 is a deficient number, since it is larger than the sum of its proper divisors (1665390232849).

81844270939199 is a wasteful number, since it uses less digits than its factorization.

81844270939199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5220659305.

The product of its (nonzero) digits is 282175488, while the sum is 74.

The spelling of 81844270939199 in words is "eighty-one trillion, eight hundred forty-four billion, two hundred seventy million, nine hundred thirty-nine thousand, one hundred ninety-nine".

Divisors: 1 61 257 15677 5220658987 318460198207 1341709359659 81844270939199