82920154205 has 18 divisors (see below), whose sum is σ = 115756058394. Its totient is φ = 56856443616.

The previous prime is 82920154201. The next prime is 82920154241. The reversal of 82920154205 is 50245102928.

It can be written as a sum of positive squares in 3 ways, for example, as 42359402596 + 40560751609 = 205814^2 + 201397^2 .

It is not a de Polignac number, because 82920154205 - 2² = 82920154201 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 (82920154201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4498067 + ... + 4516463.

It is an arithmetic number, because the mean of its divisors is an integer number (6430892133).

Almost surely, 2^82920154205 is an apocalyptic number.

It is an amenable number.

82920154205 is a deficient number, since it is larger than the sum of its proper divisors (32835904189).

82920154205 is an frugal number, since it uses more digits than its factorization.

82920154205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36813 (or 18409 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 82920154205 in words is "eighty-two billion, nine hundred twenty million, one hundred fifty-four thousand, two hundred five".