82159621947 has 32 divisors (see below), whose sum is σ = 131098282560. Its totient is φ = 50553054720.

The previous prime is 82159621937. The next prime is 82159621993. The reversal of 82159621947 is 74912695128.

It is a happy number.

82159621947 is a `hidden beast` number, since 8 + 2 + 1 + 5 + 9 + 621 + 9 + 4 + 7 = 666.

It is not a de Polignac number, because 82159621947 - 2⁴ = 82159621931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 82159621893 and 82159621902.

It is not an unprimeable number, because it can be changed into a prime (82159621927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4491043 + ... + 4509299.

It is an arithmetic number, because the mean of its divisors is an integer number (4096821330).

Almost surely, 2^82159621947 is an apocalyptic number.

82159621947 is a deficient number, since it is larger than the sum of its proper divisors (48938660613).

82159621947 is a wasteful number, since it uses less digits than its factorization.

82159621947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31100 (or 31094 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The spelling of 82159621947 in words is "eighty-two billion, one hundred fifty-nine million, six hundred twenty-one thousand, nine hundred forty-seven".