2645523806 has 4 divisors (see below), whose sum is σ = 3968285712. Its totient is φ = 1322761902.

The previous prime is 2645523781. The next prime is 2645523821. The reversal of 2645523806 is 6083255462.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6083255462 = 2 ⋅3041627731.

It is a super-2 number, since 2×2645523806² = 13997592416225451272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661380950 + ... + 661380953.

It is an arithmetic number, because the mean of its divisors is an integer number (992071428).

Almost surely, 2^2645523806 is an apocalyptic number.

2645523806 is a deficient number, since it is larger than the sum of its proper divisors (1322761906).

2645523806 is a wasteful number, since it uses less digits than its factorization.

2645523806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322761905.

The product of its (nonzero) digits is 345600, while the sum is 41.

The square root of 2645523806 is about 51434.6556904972. The cubic root of 2645523806 is about 1383.0479097711.

The spelling of 2645523806 in words is "two billion, six hundred forty-five million, five hundred twenty-three thousand, eight hundred six".