2645523857 has 4 divisors (see below), whose sum is σ = 2649812196. Its totient is φ = 2641235520.

The previous prime is 2645523821. The next prime is 2645523883. The reversal of 2645523857 is 7583255462.

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 1293049681 + 1352474176 = 35959^2 + 36776^2 .

It is a cyclic number.

It is not a de Polignac number, because 2645523857 - 2¹² = 2645519761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2645523887) 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, 2143244 + ... + 2144477.

It is an arithmetic number, because the mean of its divisors is an integer number (662453049).

Almost surely, 2^2645523857 is an apocalyptic number.

It is an amenable number.

2645523857 is a deficient number, since it is larger than the sum of its proper divisors (4288339).

2645523857 is an equidigital number, since it uses as much as digits as its factorization.

2645523857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288338.

The product of its digits is 2016000, while the sum is 47.

The square root of 2645523857 is about 51434.6561862719. The cubic root of 2645523857 is about 1383.0479186585.

The spelling of 2645523857 in words is "two billion, six hundred forty-five million, five hundred twenty-three thousand, eight hundred fifty-seven".