2145656205625 has 20 divisors (see below), whose sum is σ = 2682677768320. Its totient is φ = 1715586570000.

The previous prime is 2145656205617. The next prime is 2145656205643. The reversal of 2145656205625 is 5265026565412.

It is not a de Polignac number, because 2145656205625 - 2³ = 2145656205617 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 206896 + ... + 2081854.

It is an arithmetic number, because the mean of its divisors is an integer number (134133888416).

Almost surely, 2^{2145656205625} is an apocalyptic number.

2145656205625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2145656205625 is a deficient number, since it is larger than the sum of its proper divisors (537021562695).

2145656205625 is an equidigital number, since it uses as much as digits as its factorization.

2145656205625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876810 (or 1876795 counting only the distinct ones).

The product of its (nonzero) digits is 4320000, while the sum is 49.

The spelling of 2145656205625 in words is "two trillion, one hundred forty-five billion, six hundred fifty-six million, two hundred five thousand, six hundred twenty-five".