820656574755 has 16 divisors (see below), whose sum is σ = 1319715755424. Its totient is φ = 435461761280.

The previous prime is 820656574747. The next prime is 820656574781. The reversal of 820656574755 is 557475656028.

820656574755 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 820656574755 - 2³ = 820656574747 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138856026 + ... + 138861935.

It is an arithmetic number, because the mean of its divisors is an integer number (82482234714).

Almost surely, 2^820656574755 is an apocalyptic number.

820656574755 is a deficient number, since it is larger than the sum of its proper divisors (499059180669).

820656574755 is a wasteful number, since it uses less digits than its factorization.

820656574755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277718166.

The product of its (nonzero) digits is 70560000, while the sum is 60.

The spelling of 820656574755 in words is "eight hundred twenty billion, six hundred fifty-six million, five hundred seventy-four thousand, seven hundred fifty-five".