2145725646 has 16 divisors (see below), whose sum is σ = 4350239184. Its totient is φ = 705443904.

The previous prime is 2145725633. The next prime is 2145725749. The reversal of 2145725646 is 6465275412.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2145725598 and 2145725607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2449021 + ... + 2449896.

It is an arithmetic number, because the mean of its divisors is an integer number (271889949).

Almost surely, 2^2145725646 is an apocalyptic number.

2145725646 is an abundant number, since it is smaller than the sum of its proper divisors (2204513538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2145725646 is a wasteful number, since it uses less digits than its factorization.

2145725646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4898995.

The product of its digits is 403200, while the sum is 42.

The square root of 2145725646 is about 46321.9780018082. The cubic root of 2145725646 is about 1289.8070031565.

The spelling of 2145725646 in words is "two billion, one hundred forty-five million, seven hundred twenty-five thousand, six hundred forty-six".