2820461531857 has 4 divisors (see below), whose sum is σ = 2836044192436. Its totient is φ = 2804878871280.

The previous prime is 2820461531809. The next prime is 2820461531933. The reversal of 2820461531857 is 7581351640282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1069288356096 + 1751173175761 = 1034064^2 + 1323319^2 .

It is a cyclic number.

It is not a de Polignac number, because 2820461531857 - 2⁷ = 2820461531729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2820461531257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7791330018 + ... + 7791330379.

It is an arithmetic number, because the mean of its divisors is an integer number (709011048109).

Almost surely, 2^{2820461531857} is an apocalyptic number.

It is an amenable number.

2820461531857 is a deficient number, since it is larger than the sum of its proper divisors (15582660579).

2820461531857 is a wasteful number, since it uses less digits than its factorization.

2820461531857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15582660578.

The product of its (nonzero) digits is 3225600, while the sum is 52.

The spelling of 2820461531857 in words is "two trillion, eight hundred twenty billion, four hundred sixty-one million, five hundred thirty-one thousand, eight hundred fifty-seven".