820352031645 has 16 divisors (see below), whose sum is σ = 1312602157440. Its totient is φ = 437508114624.

The previous prime is 820352031641. The next prime is 820352031677. The reversal of 820352031645 is 546130253028.

It is a happy number.

It is not a de Polignac number, because 820352031645 - 2² = 820352031641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820352031641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276289 + ... + 1310358.

It is an arithmetic number, because the mean of its divisors is an integer number (82037634840).

Almost surely, 2^820352031645 is an apocalyptic number.

It is an amenable number.

820352031645 is a deficient number, since it is larger than the sum of its proper divisors (492250125795).

820352031645 is a wasteful number, since it uses less digits than its factorization.

820352031645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621124.

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 820352031645 in words is "eight hundred twenty billion, three hundred fifty-two million, thirty-one thousand, six hundred forty-five".